Justin spent 18 of his money on drinks, 13 of the remaining money on a pie and $40 on balloons. He had 14 of his money. How much money did he have at first?
Drinks |
Remaining amount |
Total |
1x3 |
7x3 |
8x3 |
|
Pie |
Balloons |
Left |
|
|
1x7 |
2x7 |
|
3 u |
7 u |
14 u |
24 u |
Fraction of the amount that Justin had left after spending on drinks
= 1 -
18 =
78 Fraction of the remaining amount that Justin had left after spending on a pie
= 1 -
13 =
23 The remaining amount is the combined repeated identity. Make the remaining amount the same. LCM of 7 and 3 is 21.
Amount that Justin had left
=
14 x 24 u
= 6 u
Amount that Justin spent on balloons
= 14 u - 6 u
= 8 u
8 u = 40
1 u = 40 ÷ 8 = 5
Total amount that Justin had at first
= 24 u
= 24 x 5
= $120
Answer(s): $120