Sabrina had some stickers at first. She gave 15 of her stickers to her sister and 13 of her stickers to her friend. After that, her mother gave her another 10 stickers. She had 66 stickers in the end. How many stickers did Sabrina have at first?
Fraction of stickers left after giving to her sister and her friend
= 1 -
15 -
13 = 1 -
315 -
515 = 1 -
815 =
715 Number of stickers left after giving to her sister and her friend = 7 u
Number of stickers left after her mother gave her another 10 stickers = 7 u + 10
7 u + 10 = 66
7 u = 66 - 10
7 u = 56
1 u = 56 ÷ 7 = 8
Number of stickers that Sabrina had at first
= 15 u
= 15 x 8
= 120
Answer(s): 120
