Hazel had 40 more smoothed stones than Sarah at first. After Hazel bought another 28 smoothed stones, she had thrice as many smoothed stones as Sarah. How many smoothed stones did Hazel have at first?
| |
Hazel |
Sarah |
| Before |
1 u + 40 |
1 u |
| Change |
+ 28 |
|
| After |
1 u + 68 |
1 u |
Number of smoothed stones Hazel had in the end
= 3 x 1 u
= 3 u
3 u = 1 u + 68
3 u - 1 u = 68
2 u = 68
1 u = 68 ÷ 2 = 34
Number of smoothed stones Hazel had at first
= 1 u + 40
= 34 + 40
= 74
Answer(s): 74
