Justin had
79 as many marbles as Fanny. After Justin gave away 20 marbles, he had 56 less marbles than Fanny. How many marbles did Fanny have?
| |
Justin |
Fanny |
| Before |
7 u |
9 u |
| Change |
- 20 |
|
| After |
7 u - 20 |
9 u |
Fanny had 56 more marbles than Justin in the end. So, if Justin had another 56 marbles, he would have the same number of marbles as Fanny.
9 u = 7 u - 20 + 56
9 u - 7 u = 56 - 20
2 u = 36
1 u = 36 ÷ 2 = 18
Number of marbles that Fanny had at first
= 9 u
= 9 x 18
= 162
Answer: 162
