Mathematical operations
- If ‘+’ means ‘−’, ‘−’ means ‘×’, ‘×’ means ‘÷’ and ‘÷’ means ‘+’, find the value of ? in:40 × 8 ÷ ? − 3 + 10 = 16 Answer: C. 7 Answer: (C) 7 After replacing the signs: 40 ÷ 8 + ? × 3 - 10 = 16 . 5 + 3 × ? − 10 = 16 → 3 × ? = 21 → ? = 7. 1
- Which two signs should be interchanged to make the following equation correct?16 + 5 − 2 ÷ 48 × 6 + 10 = 15 Answer: C. ÷ and × Answer: (C) ÷ and × Interchanging ÷ and × gives 16 + 5 - 2 × 48 ÷ 6 + 10 = 15 . By BODMAS the left side is 15, which equa... 1
- Select the correct combination of mathematical signs to replace the * signs (in order, from left to right) and balance the equation.48 * 6 * 4 * 15 * 3 * 11 = 26 Answer: D. ÷, ×, +, ÷, − Answer: (D) ÷, ×, +, ÷, − Put the signs ÷, ×, +, ÷, − in order: 48 ÷ 6 × 4 + 15 ÷ 3 - 11 . By BODMAS this equals 26... 1
- If the signs ‘+’ and ‘×’ are interchanged and the numbers 3 and 6 are interchanged, what will be the value of the following?6 + 9 × 3 − 12 ÷ 4 Answer: A. 30 Answer: (A) 30 Interchange the signs: 6 × 9 + 3 - 12 ÷ 4 . Interchange 3 and 6: 3 × 9 + 6 - 12 ÷ 4 . BODMAS: 27 + 6 − 3 = 30. 1
- If 5 $ 3 = 815, 7 $ 2 = 914 and 6 $ 4 = 1024, then what is the value of 8 $ 6? Answer: B. 1448 Answer: (B) 1448 5 $ 3: 5 + 3 = 8 and 5 × 3 = 15, written side by side: 815. Check 7 $ 2: 9 and 14 → 914; 6 $ 4: 10 and 24 →... 1
- If L stands for ‘÷’, M for ‘×’, P for ‘+’ and Q for ‘−’, which of the following equations is correct? Answer: B. 8 P 6 M 2 Q 4 L 2 = 18 Answer: (B) 8 P 6 M 2 Q 4 L 2 = 18 Replace the letters and evaluate each option by BODMAS. 8 + 6 × 2 - 4 ÷... 1
- If ‘+’ means ‘−’, ‘−’ means ‘+’, ‘×’ means ‘÷’ and ‘÷’ means ‘×’, then what is the value of the following?12 + 6 × 3 − 4 ÷ 2 = ? Answer: C. 18 Answer: (C) 18 After replacing the signs: 12 - 6 ÷ 3 + 4 × 2 By BODMAS (division and multiplication first, then addition and s... 1
- If A means ‘+’, B means ‘−’, C means ‘×’ and D means ‘÷’, then what is the value of the following?20 D 4 A 3 C 5 B 7 = ? Answer: A. 13 Answer: (A) 13 After replacing the signs: 20 ÷ 4 + 3 × 5 - 7 By BODMAS (division and multiplication first, then addition and s... 1
- If ‘×’ means ‘+’ and ‘+’ means ‘×’, then what is the value of the following?5 × 4 + 3 = ? Answer: D. 17 Answer: (D) 17 After replacing the signs: 5 + 4 × 3 By BODMAS (division and multiplication first, then addition and subtractio... 1
- If P means ‘×’, Q means ‘÷’, R means ‘+’ and S means ‘−’, then what is the value of the following?18 Q 3 P 4 R 6 S 5 = ? Answer: C. 25 Answer: (C) 25 After replacing the signs: 18 ÷ 3 × 4 + 6 - 5 By BODMAS (division and multiplication first, then addition and s... 1
- If ‘+’ means ‘÷’, ‘÷’ means ‘−’, ‘−’ means ‘×’ and ‘×’ means ‘+’, then what is the value of the following?36 + 6 ÷ 2 − 3 × 4 = ? Answer: A. 4 Answer: (A) 4 After replacing the signs: 36 ÷ 6 - 2 × 3 + 4 By BODMAS (division and multiplication first, then addition and sub... 1
- If @ means ‘+’, # means ‘−’, $ means ‘×’ and & means ‘÷’, then what is the value of the following?15 $ 2 # 24 & 6 @ 9 = ? Answer: A. 35 Answer: (A) 35 After replacing the signs: 15 × 2 - 24 ÷ 6 + 9 By BODMAS (division and multiplication first, then addition and... 1
- If ‘−’ means ‘+’ and ‘+’ means ‘−’, then what is the value of the following?25 − 10 + 5 = ? Answer: B. 30 Answer: (B) 30 After replacing the signs: 25 + 10 - 5 By BODMAS (division and multiplication first, then addition and subtract... 1
- Which two signs should be interchanged to make the following equation correct?20 − 3 × 10 + 6 ÷ 3 = 48 Answer: B. + and − Answer: (B) + and − Interchanging + and − gives 20 + 3 × 10 - 6 ÷ 3 = 48 . By BODMAS the left side is 48, which equals th... 1
- Which two signs should be interchanged to make the following equation correct?6 × 3 ÷ 12 − 3 + 6 = 20 Answer: D. ÷ and − Answer: (D) ÷ and − Interchanging ÷ and − gives 6 × 3 - 12 ÷ 3 + 6 = 20 . By BODMAS the left side is 20, which equals the... 1
- If the signs ‘÷’ and ‘−’ are interchanged and the numbers 4 and 8 are interchanged, what will be the value of the following?8 ÷ 4 − 2 + 6 × 3 Answer: B. 18 Answer: (B) 18 Interchange the signs: 8 - 4 ÷ 2 + 6 × 3 . Interchange 4 and 8: 4 - 8 ÷ 2 + 6 × 3 . BODMAS: 8 ÷ 2 = 4 and 6 × 3... 1
- Select the correct combination of mathematical signs to replace the * signs (in order, from left to right) and balance the equation.16 * 4 * 3 * 5 * 7 = 10 Answer: D. ÷, ×, +, − Answer: (D) ÷, ×, +, − Put the signs ÷, ×, +, − in order: 16 ÷ 4 × 3 + 5 - 7 . By BODMAS this equals 10, the right sid... 1
- If A means ‘÷’, B means ‘×’, C means ‘+’ and D means ‘−’, then what is the value of the following?144 A 12 B 3 C 15 D 9 = ? Answer: A. 42 Answer: (A) 42 After replacing the signs: 144 ÷ 12 × 3 + 15 - 9 By BODMAS (division and multiplication first, then addition an... 1
- If 7 ★ 3 = 40 and 5 ★ 2 = 21, then what is the value of 9 ★ 4? Answer: C. 65 Answer: (C) 65 7² - 3² = 49 - 9 = 40 and 5² - 2² = 25 - 4 = 21 . So a ★ b = a² - b² . 9 ★ 4 = 81 - 16 = 65 . 1
- If 3 ⊕ 4 = 19 and 5 ⊕ 2 = 17, then what is the value of 6 ⊕ 3? Answer: C. 27 Answer: (C) 27 3 × 4 + 3 + 4 = 19 and 5 × 2 + 5 + 2 = 17. So a ⊕ b = ab + a + b. 6 ⊕ 3 = 18 + 6 + 3 = 27. 1
- Select the correct combination of mathematical signs to replace the * signs (in order, from left to right) and balance the equation.9 * 6 * 3 * 4 * 2 = 15 Answer: D. +, ÷, ×, − Answer: (D) +, ÷, ×, − Put the signs +, ÷, ×, − in order: 9 + 6 ÷ 3 × 4 - 2 . By BODMAS this equals 15, the right side... 1
- Which two signs should be interchanged to make the following equation correct?36 − 12 ÷ 3 × 2 + 18 = 26 Answer: B. + and − Answer: (B) + and − Interchanging + and − gives 36 + 12 ÷ 3 × 2 - 18 = 26 . By BODMAS the left side is 26, which equals t... 1
- If ‘×’ means ‘+’, ‘+’ means ‘÷’, ‘÷’ means ‘−’ and ‘−’ means ‘×’, then what is the value of the following?72 + 8 × 5 − 3 ÷ 10 = ? Answer: A. 14 Answer: (A) 14 After replacing the signs: 72 ÷ 8 + 5 × 3 - 10 By BODMAS (division and multiplication first, then addition and... 1
- If ‘+’ and ‘−’ are interchanged and ‘×’ and ‘÷’ are interchanged, which of the following equations becomes correct? Answer: D. 20 − 4 × 2 + 3 ÷ 5 = 7 Answer: (D) 20 − 4 × 2 + 3 ÷ 5 = 7 Apply the interchange to each option and evaluate by BODMAS. 20 + 4 ÷ 2... 1