Question : Directions: Which of the following interchange of numbers would make the given equation correct? 5 × 15 + 3 + 20 – 9 = 101
Option 1: 5, 20
Option 2: 15, 20
Option 3: 3, 9
Option 4: 101, 20
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Correct Answer: 3, 9
Solution : Given: 5 × 15 + 3 + 20 – 9 = 101
Replace the original numbers given in the equation with the assigned numbers in the options one by one – First option: 5, 20 20 × 15 + 3 + 5 – 9 = 101 = 300 + 3 + 5 – 9 299 ≠ 101 Second option: 15, 20 5 × 20 + 3 + 15 – 9 = 101 = 100 + 3 + 15 – 9 109 ≠ 101 Third option: 3, 9 5 × 15 + 9 + 20 – 3 = 101 = 75 + 9 + 20 – 3 101 = 101 Fourth option: 101, 20 5 × 15 + 3 + 101 – 9 = 20 = 75 + 3 + 101 – 9 170 ≠ 20
So, only the third option satisfies the equation. Hence, the third option is correct.
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Question : Directions: Which of the following interchange of mathematical signs would make the given equation correct? 20 ÷ 4 × 8 + 16 – 15 = 11
Option 1: – and ÷
Option 2: + and –
Option 3: × and ÷
Option 4: + and ×
Question : Direction: Which of the following interchange of numbers and signs would make the given equation correct? 512 × 64 ÷ 5 + 30 – 50 = 20
Option 1: 50 and 64, + and ×
Option 2: 20 and 30, + and ÷
Option 3: 20 and 50, × and ÷
Option 4: 5 and 20, + and –
Question : Directions: Which of the following interchanges of signs would make the given equation correct? 110 ÷ 20 + 5 × 13 – 9 = 153
Option 1: × and +
Option 2: ÷ and +
Option 3: – and ×
Option 4: + and –
Question : Directions: Which of the following interchange of signs would make the given equation correct? 5 + 3 × 8 – 12 ÷ 4 = 3
Option 2: + and ×
Option 3: + and ÷
Question : Directions: Which of the following interchanges of signs and numbers would make the given equation correct? 25 – 10 ÷ 5 + 15 × 30 = 55
Option 1: × and ÷, 30 and 25
Option 2: ÷ and +, 15 and 10
Option 3: × and –, 15 and 10
Option 4: + and –, 5 and 10
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