After using
57 of her chilli powder, Mrs Oh bought another 21 kg of chilli powder. As a result, Mrs Oh now has
97 as much chilli powder as what she had at first. How many kilograms of chilli powder did Mrs Oh have at first?
| |
Chilli Powder |
Total |
| Before |
7 u |
7 u |
| Change 1 |
- 1 u |
|
| After 1 |
2 u |
|
| Change 2 |
+ 21 |
|
| After 2 |
2 u + 21 |
9 u |
Fraction of chilli powder left after using
57 of it
= 1 -
57 =
27 Amount of chilli powder left after using some = 2 u
Amount of chilli powder after buying 21 kg of chilli powder = 2 u + 21
2 u + 21 = 9 u
9 u - 2 u = 21
7 u = 21
1 u = 21 ÷ 7 = 3
Amount of chilli powder that Mrs Oh had at first
= 7 u
= 7 x 3
= 21 kg
Answer(s): 21 kg
