Gem had some erasers at first. She gave 25 of her erasers to her brother and 13 of her erasers to her best friend. After that, her mother gave her another 11 erasers. She had 55 erasers in the end. How many erasers did Gem have at first?
Fraction of erasers left after giving to her brother and her best friend
= 1 -
25 -
13 = 1 -
615 -
515 = 1 -
1115 =
415 Number of erasers left after giving to her brother and her best friend = 4 u
Number of erasers left after her mother gave her another 11 erasers = 4 u + 11
4 u + 11 = 55
4 u = 55 - 11
4 u = 44
1 u = 44 ÷ 4 = 11
Number of erasers that Gem had at first
= 15 u
= 15 x 11
= 165
Answer(s): 165
