RRB Group-D Model Paper 17 with answers for online practice

1) × and ÷
Given expression: 12 + 18 × 24 ÷ 6 – 3 = 19
After replacing the signs, we get:
L.H.S = 12 + 18 ÷ 24 × 6 – 3
= 12 + 4.5 – 3
= 16.5 – 3
= 13.5 ≠ R.H.S
2) ÷ and +
Given expression: 12 + 18 × 24 ÷ 6 – 3 = 19
After replacing the signs, we get:
L.H.S = 12 ÷ 18 × 24 + 6 – 3
= 16 + 6 – 3
= 22 – 3
= 19 = R.H.S
3) + and ×
Given expression: 12 + 18 × 24 ÷ 6 – 3 = 19
After replacing the signs, we get:
L.H.S = 12 × 18 + 24 ÷ 6 – 3
= 216 + 4 – 3
= 220 – 3
= 217 ≠ R.H.S
4) - and ÷
Given expression: 12 + 18 × 24 ÷ 6 – 3 = 19
After replacing the signs, we get:
L.H.S = 12 + 18 × 24 - 6 ÷ 3
= 12 + 432 – 2
= 444 – 2
= 442 ≠ R.H.SHence, ‘÷ and +’ is the correct answer.