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)