Zoe has 2 times as many pens as Betty. Betty has
34 as many pens as Cindy. If the three of them have a total of 78 pens, how many pens does Zoe have?
Zoe |
Betty |
Cindy |
2x3 |
1x3 |
|
|
3x1 |
4x1 |
6 u |
3 u |
4 u |
The number of pens that Betty has is repeated. Make the number of pens that Betty has the same. LCM of 1 and 3 is 3.
Total number of pens that the three of them have
= 6 u + 3 u + 4 u
= 13 u
13 u = 78
1 u = 78 ÷ 13 = 6
Number of pens that Zoe has
= 6 u
= 6 x 6
= 36
Answer(s): 36