Marion had 70 blueberry and cheese biscuits. After giving away
13 of her blueberry biscuits and 20 of her cheese biscuits, she had an equal number of blueberry and cheese biscuits. How many cheese biscuits did she have at first?
| |
Blueberry biscuits |
Cheese biscuits |
Total |
| Before |
3 u |
2 u + 20 |
70 |
| Change |
- 1 u |
- 20 |
|
| After |
2 u |
2 u |
|
Fraction of the blueberry biscuits left
= 1 -
13=
23 The number of blueberry and cheese biscuits in the end is the same.
Total number of biscuits at first
= 3 u + 2 u + 20
= 5 u + 20
5 u + 20 = 70
5 u = 70 - 20
5 u = 50
1 u = 50 ÷ 5 = 10
Number of cheese biscuits at first
= 2 u + 20
= 2 x 10 + 20
= 20 + 20
= 40
Answer(s): 40
