Barbara had some coins at first. She gave 15 of her coins to her brother and 13 of her coins to her friend. After that, her mother gave her another 18 coins. She had 74 coins in the end. How many coins did Barbara have at first?
Fraction of coins left after giving to her brother and her friend
= 1 -
15 -
13 = 1 -
315 -
515 = 1 -
815 =
715 Number of coins left after giving to her brother and her friend = 7 u
Number of coins left after her mother gave her another 18 coins = 7 u + 18
7 u + 18 = 74
7 u = 74 - 18
7 u = 56
1 u = 56 ÷ 7 = 8
Number of coins that Barbara had at first
= 15 u
= 15 x 8
= 120
Answer(s): 120
