After using
49 of her flour, Mrs Sim bought another 15 kg of flour. As a result, Mrs Sim now has
109 as much flour as what she had at first. How many kilograms of flour did Mrs Sim have at first?
| |
Flour |
Total |
| Before |
9 u |
9 u |
| Change 1 |
- 1 u |
|
| After 1 |
5 u |
|
| Change 2 |
+ 15 |
|
| After 2 |
5 u + 15 |
10 u |
Fraction of flour left after using
49 of it
= 1 -
49 =
59 Amount of flour left after using some = 5 u
Amount of flour after buying 15 kg of flour = 5 u + 15
5 u + 15 = 10 u
10 u - 5 u = 15
5 u = 15
1 u = 15 ÷ 5 = 3
Amount of flour that Mrs Sim had at first
= 9 u
= 9 x 3
= 27 kg
Answer(s): 27 kg
