After using
57 of her sugar, Mrs Kok bought another 12 kg of sugar. As a result, Mrs Kok now has
87 as much sugar as what she had at first. How many kilograms of sugar did Mrs Kok have at first?
| |
Sugar |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
2 u |
|
| Change 2 |
+ 12 |
|
| After 2 |
2 u + 12 |
8 u |
Fraction of sugar left after using
57 of it
= 1 -
57 =
27 Amount of sugar left after using some = 2 u
Amount of sugar after buying 12 kg of sugar = 2 u + 12
2 u + 12 = 8 u
8 u - 2 u = 12
6 u = 12
1 u = 12 ÷ 6 = 2
Amount of sugar that Mrs Kok had at first
= 7 u
= 7 x 2
= 14 kg
Answer(s): 14 kg
