After using
19 of her flour, Mrs Quek bought another 10 kg of flour. As a result, Mrs Quek now has
109 as much flour as what she had at first. How many kilograms of flour did Mrs Quek have at first?
| |
Flour |
Total |
| Before |
9 u |
9 u |
| Change 1 |
- 1 u |
|
| After 1 |
8 u |
|
| Change 2 |
+ 10 |
|
| After 2 |
8 u + 10 |
10 u |
Fraction of flour left after using
19 of it
= 1 -
19 =
89 Amount of flour left after using some = 8 u
Amount of flour after buying 10 kg of flour = 8 u + 10
8 u + 10 = 10 u
10 u - 8 u = 10
2 u = 10
1 u = 10 ÷ 2 = 5
Amount of flour that Mrs Quek had at first
= 9 u
= 9 x 5
= 45 kg
Answer(s): 45 kg
