Alice's stamp collection was 75% of the size of Raymond's. After Alice sold 40% of her stamps and Raymond sold 20% of his stamps, Alice had 140 fewer stamps than Raymond. How many stamps did Alice sell?

Raymond's stamp collection ➞x

Alice′s stamp collection➞75%x

75%x-40%*75%x+140=x-20%x

75%x-30%x+140=80%x

45%x+140=80%x

140=80%x-45%x

x=400

Raymond′s stamp collection ➞400

Alice′s stamp collection➞300

Alice sold 300*40%=120

Answer:120