After using
17 of her sugar, Mrs Chua bought another 30 kg of sugar. As a result, Mrs Chua now has
127 as much sugar as what she had at first. How many kilograms of sugar did Mrs Chua have at first?
|
Sugar |
Total |
Before |
7 u |
7 u |
Change 1 |
- 1 u |
|
After 1 |
6 u |
|
Change 2 |
+ 30 |
|
After 2 |
6 u + 30 |
12 u |
Fraction of sugar left after using
17 of it
= 1 -
17 =
67 Amount of sugar left after using some = 6 u
Amount of sugar after buying 30 kg of sugar = 6 u + 30
6 u + 30 = 12 u
12 u - 6 u = 30
6 u = 30
1 u = 30 ÷ 6 = 5
Amount of sugar that Mrs Chua had at first
= 7 u
= 7 x 5
= 35 kg
Answer(s): 35 kg