Lucy had some coins at first. She gave 19 of her coins to her brother and 13 of her coins to her best friend. After that, her mother gave her another 9 coins. She had 29 coins in the end. How many coins did Lucy have at first?
Fraction of coins left after giving to her brother and her best friend
= 1 -
19 -
13 = 1 -
19 -
39 = 1 -
49 =
59 Number of coins left after giving to her brother and her best friend = 5 u
Number of coins left after her mother gave her another 9 coins = 5 u + 9
5 u + 9 = 29
5 u = 29 - 9
5 u = 20
1 u = 20 ÷ 5 = 4
Number of coins that Lucy had at first
= 9 u
= 9 x 4
= 36
Answer(s): 36
