Vanessa bought four times as many biscuits as Dylan. After Vanessa ate 7 biscuits, she had 8 more biscuits than Dylan. How many biscuits did they buy altogether?
| |
Vanessa |
Dylan |
Total |
| Before |
4 u |
1 u |
5 u |
| Change |
- 7 |
|
|
| After |
4 u - 7 |
1 u |
|
The number of biscuits that Dylan had remains unchanged.
If Dylan had another 8 biscuits in the end, the number of biscuits that Vanessa and Dylan had would be the same.
4 u - 7 = 1 u + 8
4 u - 1 u = 8 + 7
3 u = 15
1 u = 15 ÷ 3 = 5
Total number of biscuits
= 4 u + 1 u
= 5 u
= 5 x 5
= 25
Answer(s): 25
