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The average per day income of A, B and C is ₹ 450. If the aver-age per day income of A and B be ₹ 400 and that of B and C be ₹ 430, the per day income of B is
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- ₹ 300
- ₹ 310
- ₹ 415
- ₹ 425
- ₹ 300
Correct Option: B
Here ,The average per day income of A, B and C = ₹ 450.
⇒ Total daily income of A, B and C = 3 × 450 = ₹ 1350
The average per day income of A and B = ₹ 400
⇒ Total daily income of A and B = 2 × 400 = ₹ 800
The average per day income of B and C = ₹ 430
⇒ Total daily income of B and C = 2 × 430 = ₹ 860
∴ B’sdaily income = ₹ (800 + 860 – 1350) = ₹ 310
