Cindy has 2 times as many pens as Nicole. Nicole has
57 as many pens as Betty. If the three of them have a total of 220 pens, how many pens does Betty have?
Cindy |
Nicole |
Betty |
2x5 |
1x5 |
|
|
5x1 |
7x1 |
10 u |
5 u |
7 u |
The number of pens that Nicole has is repeated. Make the number of pens that Nicole has the same. LCM of 1 and 5 is 5.
Total number of pens that the three of them have
= 10 u + 5 u + 7 u
= 22 u
22 u = 220
1 u = 220 ÷ 22 = 10
Number of pens that Betty has
= 7 u
= 7 x 10
= 70
Answer(s): 70