After using
35 of her sugar, Mrs Zhang bought another 27 kg of sugar. As a result, Mrs Zhang now has
115 as much sugar as what she had at first. How many kilograms of sugar did Mrs Zhang have at first?
|
Sugar |
Total |
Before |
5 u |
5 u |
Change 1 |
- 1 u |
|
After 1 |
2 u |
|
Change 2 |
+ 27 |
|
After 2 |
2 u + 27 |
11 u |
Fraction of sugar left after using
35 of it
= 1 -
35 =
25 Amount of sugar left after using some = 2 u
Amount of sugar after buying 27 kg of sugar = 2 u + 27
2 u + 27 = 11 u
11 u - 2 u = 27
9 u = 27
1 u = 27 ÷ 9 = 3
Amount of sugar that Mrs Zhang had at first
= 5 u
= 5 x 3
= 15 kg
Answer(s): 15 kg