Natasha has 3 times as much money as Carla, and Carla has twice as much money as Cosima. If Natasha has $60, and the three decide to buy goods worth the total amount they have and sell the goods at 7/5 of the buying price, how much profit would they make?
Let's be accurate as possible and think first.
36
If Natasha has $60, which is 3 times as much money as Carla, Carla has $60 / 3 = $20.

Together, Carla and Natasha have $20 + $60 = $80.

Carla has twice as much money as Cosima, meaning Cosima has $20 / 2 = $10.

Combined, the three have $10 + $80 = $90.

If they buy goods with the amount they have and sell at 7 / 5 of the buying price, the total amount of money they will get from selling the goods is 7 / 5 * 90 = $126.

If they earn $126 from the sale of the goods they bought with the money they had, their profit is $126 - $90 = $36.

.

Final answer: 36