After using
411 of her sugar, Mrs Chong bought another 10 kg of sugar. As a result, Mrs Chong now has
1211 as much sugar as what she had at first. How many kilograms of sugar did Mrs Chong have at first?
|
Sugar |
Total |
Before |
11 u |
11 u |
Change 1 |
- 1 u |
|
After 1 |
7 u |
|
Change 2 |
+ 10 |
|
After 2 |
7 u + 10 |
12 u |
Fraction of sugar left after using
411 of it
= 1 -
411 =
711 Amount of sugar left after using some = 7 u
Amount of sugar after buying 10 kg of sugar = 7 u + 10
7 u + 10 = 12 u
12 u - 7 u = 10
5 u = 10
1 u = 10 ÷ 5 = 2
Amount of sugar that Mrs Chong had at first
= 11 u
= 11 x 2
= 22 kg
Answer(s): 22 kg