Ben had
58 as many marbles as Nora. After Ben bought another 6 marbles, he had 18 less marbles than Nora. How many marbles did Ben have at first?
| |
Ben |
Nora |
| Before |
5 u |
8 u |
| Change |
+ 6 |
|
| After |
5 u + 6 |
8 u |
Nora had 18 more marbles than Ben in the end. So, if Ben had another 18 marbles, he would have the same number of marbles as Nora.
8 u = 5 u + 6 + 18
8 u - 5 u = 6 + 18
3 u = 24
1 u = 24 ÷ 3 = 8
Number of marbles that Ben had at first
= 5 u
= 5 x 8
= 40
Answer: 40
