After using
19 of her curry powder, Mrs Choy bought another 20 kg of curry powder. As a result, Mrs Choy now has
109 as much curry powder as what she had at first. How many kilograms of curry powder did Mrs Choy have at first?
| |
Curry Powder |
Total |
| Before |
9 u |
9 u |
| Change 1 |
- 1 u |
|
| After 1 |
8 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
8 u + 20 |
10 u |
Fraction of curry powder left after using
19 of it
= 1 -
19 =
89 Amount of curry powder left after using some = 8 u
Amount of curry powder after buying 20 kg of curry powder = 8 u + 20
8 u + 20 = 10 u
10 u - 8 u = 20
2 u = 20
1 u = 20 ÷ 2 = 10
Amount of curry powder that Mrs Choy had at first
= 9 u
= 9 x 10
= 90 kg
Answer(s): 90 kg
