After using
14 of her chilli powder, Mrs Lu bought another 20 kg of chilli powder. As a result, Mrs Lu now has
84 as much chilli powder as what she had at first. How many kilograms of chilli powder did Mrs Lu have at first?
| |
Chilli Powder |
Total |
| Before |
4 u |
4 u |
| Change 1 |
- 1 u |
|
| After 1 |
3 u |
|
| Change 2 |
+ 20 |
|
| After 2 |
3 u + 20 |
8 u |
Fraction of chilli powder left after using
14 of it
= 1 -
14 =
34 Amount of chilli powder left after using some = 3 u
Amount of chilli powder after buying 20 kg of chilli powder = 3 u + 20
3 u + 20 = 8 u
8 u - 3 u = 20
5 u = 20
1 u = 20 ÷ 5 = 4
Amount of chilli powder that Mrs Lu had at first
= 4 u
= 4 x 4
= 16 kg
Answer(s): 16 kg
