Weiwen and Huiling shared the cost of a birthday present in the ratio 5 : 3 respectively. The present cost $120. How much did Weiwen pay for the presents?
The ratio of Weiwen and Huiling's share of the cost is 5:3, which means Weiwen paid 5/8 of the total cost (5/8 * $120 = $<<5/8*120=75>>75). Answer: \boxed{75}.
