Mary had 109 cranberry and blueberry biscuits. After giving away
13 of her cranberry biscuits and 19 of her blueberry biscuits, she had an equal number of cranberry and blueberry biscuits. How many blueberry biscuits did she have at first?
| |
Cranberry biscuits |
Blueberry biscuits |
Total |
| Before |
3 u |
2 u + 19 |
109 |
| Change |
- 1 u |
- 19 |
|
| After |
2 u |
2 u |
|
Fraction of the cranberry biscuits left
= 1 -
13=
23 The number of cranberry and blueberry biscuits in the end is the same.
Total number of biscuits at first
= 3 u + 2 u + 19
= 5 u + 19
5 u + 19 = 109
5 u = 109 - 19
5 u = 90
1 u = 90 ÷ 5 = 18
Number of blueberry biscuits at first
= 2 u + 19
= 2 x 18 + 19
= 36 + 19
= 55
Answer(s): 55
