After using
15 of her sugar, Mrs Chan bought another 14 kg of sugar. As a result, Mrs Chan now has
115 as much sugar as what she had at first. How many kilograms of sugar did Mrs Chan have at first?
| |
Sugar |
Total |
| Before |
5 u |
5 u |
| Change 1 |
- 1 u |
|
| After 1 |
4 u |
|
| Change 2 |
+ 14 |
|
| After 2 |
4 u + 14 |
11 u |
Fraction of sugar left after using
15 of it
= 1 -
15 =
45 Amount of sugar left after using some = 4 u
Amount of sugar after buying 14 kg of sugar = 4 u + 14
4 u + 14 = 11 u
11 u - 4 u = 14
7 u = 14
1 u = 14 ÷ 7 = 2
Amount of sugar that Mrs Chan had at first
= 5 u
= 5 x 2
= 10 kg
Answer(s): 10 kg
