After using
18 of her flour, Mrs Leng bought another 10 kg of flour. As a result, Mrs Leng now has
98 as much flour as what she had at first. How many kilograms of flour did Mrs Leng have at first?
| |
Flour |
Total |
| Before |
8 u |
8 u |
| Change 1 |
- 1 u |
|
| After 1 |
7 u |
|
| Change 2 |
+ 10 |
|
| After 2 |
7 u + 10 |
9 u |
Fraction of flour left after using
18 of it
= 1 -
18 =
78 Amount of flour left after using some = 7 u
Amount of flour after buying 10 kg of flour = 7 u + 10
7 u + 10 = 9 u
9 u - 7 u = 10
2 u = 10
1 u = 10 ÷ 2 = 5
Amount of flour that Mrs Leng had at first
= 8 u
= 8 x 5
= 40 kg
Answer(s): 40 kg
