Archie had some marbles at first. After he bought another 84 marbles, he had four times as many marbles as before. How many marbles did Archie have at first?
| |
Marbles |
| Before |
1 u |
| Change |
+ 84 |
| After |
1 u + 84 = 4 u |
Number of marbles after he bought = 1 u + 84
Number of marbles that is four times as many marbles as before = 4 x 1 u = 4 u
4 u = 1 u + 84
4 u - 1 u = 84
3 u = 84
1 u = 84 ÷ 3 = 28
Number of stickers that Kim had at first
= 1 u
= 28
Answer(s): 28
