Billy spent 18 of his money on snacks, 16 of the remaining money on a swiss roll and $76 on balloons. He had 13 of his money. How much money did he have at first?
| Snacks |
Remaining amount |
Total |
| 1x6 |
7x6 |
8x6 |
| |
Swiss Roll |
Balloons |
Left |
|
| |
1x7 |
5x7 |
|
| 6 u |
7 u |
35 u |
48 u |
Fraction of the amount that Billy had left after spending on snacks
= 1 -
18 =
78 Fraction of the remaining amount that Billy had left after spending on a swiss roll
= 1 -
16 =
56 The remaining amount is the combined repeated identity. Make the remaining amount the same. LCM of 7 and 6 is 42.
Amount that Billy had left
=
13 x 48 u
= 16 u
Amount that Billy spent on balloons
= 35 u - 16 u
= 19 u
19 u = 76
1 u = 76 ÷ 19 = 4
Total amount that Billy had at first
= 48 u
= 48 x 4
= $192
Answer(s): $192
