RRB Group-D Model Paper 20 with answers for online practice

1) ÷ and ×
Given expression: 168 - 12 + 152 ÷ 26 × 6 = 10
After replacing the signs, we get:
L.H.S = 168 - 12 + 152 × 26 ÷ 6
= 168 – 12 + 658.66
= 826.66 – 12
= 814.66 ≠ R.H.S
2) ÷ and –
Given expression: 168 - 12 + 152 ÷ 26 × 6 = 10
After replacing the signs, we get:
L.H.S = 168 ÷ 12 + 152 - 26 × 6
= 14 + 152 – 156
= 166 – 156
= 10 = R.H.S
3) ÷ and +
Given expression: 168 - 12 + 152 ÷ 26 × 6 = 10
After replacing the signs, we get:
L.H.S = 168 - 12 ÷ 152 + 26 × 6
= 168 – 0.0789 + 26 x 6
= 168 - 0.0789 + 156
= 324 - 0.0789
= 323.9211 ≠ R.H.S
4) + and –
Given expression: 168 - 12 + 152 ÷ 26 × 6 = 10
After replacing the signs, we get:
L.H.S = 168 + 12 - 152 ÷ 26 × 6
= 168 + 12 – 35.07
= 180 – 35.07
= 144.93 ≠ R.H.S
Hence, ‘÷ and -’ is the correct answer.