840 stickers were given to 42 children. ⅔ of the children were boys, and each of them received the same number of stickers. Each girl received twice as many stickers as each boy. How many stickers did each girl receive? Explain how you got your answer.

Answer 1

28 were boys, and each got x stickers.

28x + 14*2x = 840
x = 15

so, each girl got 30