Bryan had some pens at first. After he bought another 70 pens, he had thrice as many pens as before. How many pens did Bryan have at first?
| |
Pens |
| Before |
1 u |
| Change |
+ 70 |
| After |
1 u + 70 = 3 u |
Number of pens after he bought = 1 u + 70
Number of pens that is thrice as many pens as before = 3 x 1 u = 3 u
3 u = 1 u + 70
3 u - 1 u = 70
2 u = 70
1 u = 70 ÷ 2 = 35
Number of stickers that Kim had at first
= 1 u
= 35
Answer(s): 35
