Mark spent 18 of his money on drinks, 14 of the remaining money on a pie and $20 on balloons. He had 12 of his money. How much money did he have at first?
Drinks |
Remaining amount |
Total |
1x4 |
7x4 |
8x4 |
|
Pie |
Balloons |
Left |
|
|
1x7 |
3x7 |
|
4 u |
7 u |
21 u |
32 u |
Fraction of the amount that Mark had left after spending on drinks
= 1 -
18 =
78 Fraction of the remaining amount that Mark had left after spending on a pie
= 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 Mark had left
=
12 x 32 u
= 16 u
Amount that Mark spent on balloons
= 21 u - 16 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Total amount that Mark had at first
= 32 u
= 32 x 4
= $128
Answer(s): $128