Jade and Emma had an equal number of cards at first. Jade used
15 of her cards and Emma used
19 of her cards. They used 70 cards altogether. How many cards did Emma have in the end?
| |
Jade |
Emma |
| Before |
5x9 =
45 u |
9x5 =
45 u |
| Change |
- 1x9 =
- 9 u |
- 1x5 =
- 5 u |
| After |
4x9 =
36 u |
8x5 =
40 u |
The number of cards that Jade and Emma each had at first is the same. Make the number of cards that Jade and Emma each had at first the same. LCM of 5 and 9 is 45.
Number of cards that Jade and Emma used
= 9 u + 5 u
= 14 u
14 u = 70
1 u = 70 ÷ 14 = 5
Number of cards that Emma had in the end
= 40 u
= 40 x 5
= 200
Answer(s): 200
