Akash started a business with Rs.30,000 and is joined afterwards by Babu with Rs.72,000. After how many months did Babu join if the profits at the end of the year are divided equally?

Correct option is A

Akash investment = 30000 for 12 months
Let Babu join after x months
So Babu invests for (12 − x) months

Equal profit means
30000 × 12 = 72000 × (12 − x)
360000 = 72000(12 − x)
5 = 12 − x
x = 7