Natalie and Sarah had an equal number of marbles at first. Natalie used
15 of her marbles and Sarah used
110 of her marbles. They used 24 marbles altogether. How many marbles did Sarah have in the end?
| |
Natalie |
Sarah |
| Before |
5x2 =
10 u |
10x1 =
10 u |
| Change |
- 1x2 =
- 2 u |
- 1x1 =
- 1 u |
| After |
4x2 =
8 u |
9x1 =
9 u |
The number of marbles that Natalie and Sarah each had at first is the same. Make the number of marbles that Natalie and Sarah each had at first the same. LCM of 5 and 10 is 10.
Number of marbles that Natalie and Sarah used
= 2 u + 1 u
= 3 u
3 u = 24
1 u = 24 ÷ 3 = 8
Number of marbles that Sarah had in the end
= 9 u
= 9 x 8
= 72
Answer(s): 72
