After using
310 of her sugar, Mrs Chew bought another 25 kg of sugar. As a result, Mrs Chew now has
1210 as much sugar as what she had at first. How many kilograms of sugar did Mrs Chew have at first?
|
Sugar |
Total |
Before |
10 u |
10 u |
Change 1 |
- 1 u |
|
After 1 |
7 u |
|
Change 2 |
+ 25 |
|
After 2 |
7 u + 25 |
12 u |
Fraction of sugar left after using
310 of it
= 1 -
310 =
710 Amount of sugar left after using some = 7 u
Amount of sugar after buying 25 kg of sugar = 7 u + 25
7 u + 25 = 12 u
12 u - 7 u = 25
5 u = 25
1 u = 25 ÷ 5 = 5
Amount of sugar that Mrs Chew had at first
= 10 u
= 10 x 5
= 50 kg
Answer(s): 50 kg