Tammy and Gabby had an equal number of coins at first. Tammy used
14 of her coins and Gabby used
17 of her coins. They used 99 coins altogether. How many coins did Gabby have in the end?
|
Tammy |
Gabby |
Before |
4x7 = 28 u |
7x4 = 28 u |
Change |
- 1x7 = - 7 u |
- 1x4 = - 4 u |
After |
3x7 = 21 u |
6x4 = 24 u |
The number of coins that Tammy and Gabby each had at first is the same. Make the number of coins that Tammy and Gabby each had at first the same. LCM of 4 and 7 is 28.
Number of coins that Tammy and Gabby used
= 7 u + 4 u
= 11 u
11 u = 99
1 u = 99 ÷ 11 = 9
Number of coins that Gabby had in the end
= 24 u
= 24 x 9
= 216
Answer(s): 216