Question

Which two signs should be interchanged to make the below equation mathematically correct?
56 - 14 + 42 ÷ 5 × 10 = 63
1. ÷, +
2. ÷, -
3. ×, ÷
4. ×, +

Answer 1

Correct Answer - Option 3 : ×, ÷

1) ÷, +

Given equation: 56 - 14 + 42 ÷ 5 × 10 = 63

After interchanging the signs, we get:

L.H.S = 56 - 14 ÷ 42 + 5 × 10

= 56 – 0.33 + 50

= 106 – 0.33

= 105.67 ≠ R.H.S

2) ÷, -

Given equation: 56 - 14 + 42 ÷ 5 × 10 = 63

After interchanging the signs, we get:

L.H.S = 56 ÷ 14 + 42 - 5 × 10

= 4 + 42 – 50

= 46 – 50

= -4 ≠ R.H.S

3) ×, ÷

Given equation: 56 - 14 + 42 ÷ 5 × 10 = 63

After interchanging the signs, we get:

L.H.S = 56 - 14 + 42 × 5 ÷ 10

= 56 – 14 + 21

= 77 – 14

= 63 = R.H.S

4) ×, +

Given equation: 56 - 14 + 42 ÷ 5 × 10 = 63

After interchanging the signs, we get:

L.H.S = 56 - 14 × 42 ÷ 5 + 10

= 56 – 117.6 + 10

= 66 – 117.6

= -51.6

Hence, ‘×, ÷’ is the correct answer.