A can build a wall in 30 days which B can build in 40 days. If they build it together and get a payment of Rs. 700, what is B’s share?

Answer : Option C

Explanation :

Ratio of A’s and B’s 1 day’s work $=\frac{1}{30}: \frac{1}{40}=4: 3$ Sum of the terms of ratio = 4 + 3 = 7 $\therefore$ B’s share $=\frac{3}{7} \times 700=$ Rs. 300 Alternative:

According to the question,

7 unit → 700

1 unit → 100

3 unit → 300 Share of B = Rs. 300