Mrs Ma had a sum of money. She gave her father $240 and gave
15 of the remaining money to her son. She used
56 of the rest of the money on a notebook and was left with
19 of the amount she had at first. What was the sum of money she had at first?
Her father |
Her son |
Remaining amount |
Total |
$240 |
1x3 |
4x3 |
|
|
|
Notebook |
Left |
|
|
|
5x2 |
1x2 |
|
8x2 = 16 u |
1x2 = 2 u |
|
3 u |
3 u |
10 u |
2 u |
18 u |
Fraction of the remaining amount left
= 1 -
56=
16The remaining amount is repeated. Make the remaining amount the same. LCM of 4 and 6 is 12.
The amount left is repeated. Make the amount left the same.
16 Remaining amount =
19 Total amount
Amount that Mrs Ma gave to her father
= 16 u - 3 u - 10 u
= 3 u
3 u = 240
1 u = 240 ÷ 3 = 80
Total amount that Mrs Ma had at first
= 3 u + 3 u + 10 u + 2 u
= 18 u
= 18 x 80
= $1440
Answer(s): $1440