Adam, Charlie and Bryan have $1209.
After Adam spends
35 of his money,
Charlie spends
18 of his money and
Bryan spends
23 of his money,
they have equal amount of money left.
Find the total amount that the 3 children spend.
|
Adam |
Charlie |
Bryan |
Before |
5 x 7 = 35 u |
8 x 2 = 16 u |
3 x 14 = 42 u |
Change |
- 3 x 7 = - 21 u |
- 1 x 2 = - 2 u |
- 2 x 14 = - 28 u |
After |
2 x 7 = 14 u |
7 x 2 = 14 u |
1 x 14 = 14 u |
The lowest common multiple of 2, 7 and 1 is 14.
Fraction of the amount left after Adam spends his money
= 1 -
35 =
25 Fraction of the amount left after Charlie spends his money
= 1 -
18 =
78 Fraction of the amount left after Bryan spends his money
= 1 -
23 =
13 Make the numerators the same.
2 x 75 x 7 of Adam's amount =
7 x 28 x 2 of Charlie's amount =
1 x 143 x 14 of Bryan's amount
1435 of Adam's amount =
1416 of Charlie's amount =
1442 of Bryan's amount
Total amount that they have at first
= 35 u + 16 u + 42 u
= 93 u
93 u = 1209
1 u = 1209 ÷ 93 = 13
Amount that Adam spends
= 35 u - 14 u
= 21 u
Amount that Charlie spends
= 16 u - 14 u
= 2 u
Amount that Bryan spends
= 42 u - 14 u
= 28 u
Amount that they spend
= 21 u + 2 u + 28 u
= 51 u
= 51 x 13
= $663
Answer(s): $663