After using
38 of her flour, Mrs Ma bought another 12 kg of flour. As a result, Mrs Ma now has
98 as much flour as what she had at first. How many kilograms of flour did Mrs Ma have at first?
| |
Flour |
Total |
| Before |
8 u |
8 u |
| Change 1 |
- 1 u |
|
| After 1 |
5 u |
|
| Change 2 |
+ 12 |
|
| After 2 |
5 u + 12 |
9 u |
Fraction of flour left after using
38 of it
= 1 -
38 =
58 Amount of flour left after using some = 5 u
Amount of flour after buying 12 kg of flour = 5 u + 12
5 u + 12 = 9 u
9 u - 5 u = 12
4 u = 12
1 u = 12 ÷ 4 = 3
Amount of flour that Mrs Ma had at first
= 8 u
= 8 x 3
= 24 kg
Answer(s): 24 kg
