Opal and Roshel had an equal number of cards at first. Opal used
14 of her cards and Roshel used
19 of her cards. They used 130 cards altogether. How many cards did Roshel have in the end?
| |
Opal |
Roshel |
| Before |
4x9 =
36 u |
9x4 =
36 u |
| Change |
- 1x9 =
- 9 u |
- 1x4 =
- 4 u |
| After |
3x9 =
27 u |
8x4 =
32 u |
The number of cards that Opal and Roshel each had at first is the same. Make the number of cards that Opal and Roshel each had at first the same. LCM of 4 and 9 is 36.
Number of cards that Opal and Roshel used
= 9 u + 4 u
= 13 u
13 u = 130
1 u = 130 ÷ 13 = 10
Number of cards that Roshel had in the end
= 32 u
= 32 x 10
= 320
Answer(s): 320
