Tommy had
79 as many beads as Marion. After Tommy gave away 10 beads, he had 50 less beads than Marion. How many beads did Marion have?
| |
Tommy |
Marion |
| Before |
7 u |
9 u |
| Change |
- 10 |
|
| After |
7 u - 10 |
9 u |
Marion had 50 more beads than Tommy in the end. So, if Tommy had another 50 beads, he would have the same number of beads as Marion.
9 u = 7 u - 10 + 50
9 u - 7 u = 50 - 10
2 u = 40
1 u = 40 ÷ 2 = 20
Number of beads that Marion had at first
= 9 u
= 9 x 20
= 180
Answer: 180
