Hứa 5 sao và ctlhn. Mary and Peter have 80 stickers. Peter has stickers three times as many as Mary has. How many stickers each of them has?

2 câu trả lời

Give Mary's stickers are `x (x>0)`

        Peter's stickers are `3x`

Mary and Peter have `80` stickers so

`x+3x = 80`

`4x = 80`

   `x = 20`

⇒ `3x = 3×20 = 60`

Therefore , Mary has `20` stickers

                   Peter has `60` stickers

Mary has the number of books: 80: (3 + 1) = 20 (book)

Peter's number of books : 80-20 = 60 (book)

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