By interchanging the given two numbers (not digits) which of the following equation will NOT be correct?
2 and 8
I. 9 × 8 + 2 − 9 ÷ 3 = 23
II. 7 × 2 + 8 − 4 ÷ 2 = 56
Show answer & explanation
Correct answer: B
Explanation
I. 9×8+2−9÷3=23
Substituting 2 and 8:
9×2+8−9÷3=23
9×2+8−3=23
18+8−3=23
26−3=23
23 =23 (true)
II. 7×2+8−4÷2=56
Substituting 2 and 8:
7×8+2−4÷8=56
7×8+2−1/2=56
56+2−1/2=56
57.5 = 56(false)
Correct Answer: 2) Only II