After using
111 of her flour, Mrs Teo bought another 30 kg of flour. As a result, Mrs Teo now has
1211 as much flour as what she had at first. How many kilograms of flour did Mrs Teo have at first?
| |
Flour |
Total |
| Before |
11 u |
11 u |
| Change 1 |
- 1 u |
|
| After 1 |
10 u |
|
| Change 2 |
+ 30 |
|
| After 2 |
10 u + 30 |
12 u |
Fraction of flour left after using
111 of it
= 1 -
111 =
1011 Amount of flour left after using some = 10 u
Amount of flour after buying 30 kg of flour = 10 u + 30
10 u + 30 = 12 u
12 u - 10 u = 30
2 u = 30
1 u = 30 ÷ 2 = 15
Amount of flour that Mrs Teo had at first
= 11 u
= 11 x 15
= 165 kg
Answer(s): 165 kg
