Risa and Tiffany bought a souvenir for their cousin. They shared the cost equally between them. Risa used
15 of her savings while Tiffany used
35 of her savings. What fraction of their total savings was used to buy the souvenir?
Each girl shared half the cost of the souvenir. The amount that each of them spent is the same.
Make the numerators the same. LCM of 1 and 3 is 3.
15 of Risa's savings =
35 of Tiffany's savings
315 of Risa's savings =
35 of Tiffany's savings
| |
Risa |
Tiffany |
Total |
| Before |
15 u |
5 u |
20 u |
| Change |
- 3 u |
- 3 u |
- 6 u |
| After |
12 u |
2 u |
14 u |
Amount of savings spent
= 3 u + 3 u
= 6 u
Total amount of savings at first
= 15 u + 5 u
= 20 u
Fraction of their total savings used
=
620=
310 Answer(s):
310 
