Tammy had some coins at first. She gave 19 of her coins to her sister and 23 of her coins to her best friend. After that, her mother gave her another 3 coins. She had 17 coins in the end. How many coins did Tammy have at first?
Fraction of coins left after giving to her sister and her best friend
= 1 -
19 -
23 = 1 -
19 -
69 = 1 -
79 =
29 Number of coins left after giving to her sister and her best friend = 2 u
Number of coins left after her mother gave her another 3 coins = 2 u + 3
2 u + 3 = 17
2 u = 17 - 3
2 u = 14
1 u = 14 ÷ 2 = 7
Number of coins that Tammy had at first
= 9 u
= 9 x 7
= 63
Answer(s): 63
