Riordan spent 18 of his money on balloons, 14 of the remaining money on a swiss roll and $45 on snacks. He had 12 of his money. How much money did he have at first?
| Balloons |
Remaining amount |
Total |
| 1x4 |
7x4 |
8x4 |
| |
Swiss Roll |
Snacks |
Left |
|
| |
1x7 |
3x7 |
|
| 4 u |
7 u |
21 u |
32 u |
Fraction of the amount that Riordan had left after spending on balloons
= 1 -
18 =
78 Fraction of the remaining amount that Riordan had left after spending on a swiss roll
= 1 -
14 =
34 The remaining amount is the combined repeated identity. Make the remaining amount the same. LCM of 7 and 4 is 28.
Amount that Riordan had left
=
12 x 32 u
= 16 u
Amount that Riordan spent on snacks
= 21 u - 16 u
= 5 u
5 u = 45
1 u = 45 ÷ 5 = 9
Total amount that Riordan had at first
= 32 u
= 32 x 9
= $288
Answer(s): $288
