Charlie spent 18 of his money on balloons, 15 of the remaining money on a cake and $72 on drinks. He had 12 of his money. How much money did he have at first?
| Balloons |
Remaining amount |
Total |
| 1x5 |
7x5 |
8x5 |
| |
Cake |
Drinks |
Left |
|
| |
1x7 |
4x7 |
|
| 5 u |
7 u |
28 u |
40 u |
Fraction of the amount that Charlie had left after spending on balloons
= 1 -
18 =
78 Fraction of the remaining amount that Charlie had left after spending on a cake
= 1 -
15 =
45 The remaining amount is the combined repeated identity. Make the remaining amount the same. LCM of 7 and 5 is 35.
Amount that Charlie had left
=
12 x 40 u
= 20 u
Amount that Charlie spent on drinks
= 28 u - 20 u
= 8 u
8 u = 72
1 u = 72 ÷ 8 = 9
Total amount that Charlie had at first
= 40 u
= 40 x 9
= $360
Answer(s): $360
