Mrs Peh had a sum of money. She gave her son $324 and gave
16 of the remaining money to her mother. She used
56 of the rest of the money on a laptop and was left with
18 of the amount she had at first. What was the sum of money she had at first?
| Her son |
Her mother |
Remaining amount |
Total |
| $324 |
1x6 |
5x6 |
|
| |
|
Laptop |
Left |
|
| |
|
5x5 |
1x5 |
|
7x5 =
35 u |
1x5 =
5 u |
|
| 4 u |
6 u |
25 u |
5 u |
40 u |
Fraction of the remaining amount left
= 1 -
56=
16The remaining amount is repeated. Make the remaining amount the same. LCM of 5 and 6 is 30.
The amount left is repeated. Make the amount left the same.
16 Remaining amount =
18 Total amount
Amount that Mrs Peh gave to her son
= 35 u - 6 u - 25 u
= 4 u
4 u = 324
1 u = 324 ÷ 4 = 81
Total amount that Mrs Peh had at first
= 4 u + 6 u + 25 u + 5 u
= 40 u
= 40 x 81
= $3240
Answer(s): $3240
