Olivia has 4 times as many pens as Irene. Irene has
47 as many pens as Sarah. If the three of them have a total of 243 pens, how many pens does Sarah have?
Olivia |
Irene |
Sarah |
4x4 |
1x4 |
|
|
4x1 |
7x1 |
16 u |
4 u |
7 u |
The number of pens that Irene has is repeated. Make the number of pens that Irene has the same. LCM of 1 and 4 is 4.
Total number of pens that the three of them have
= 16 u + 4 u + 7 u
= 27 u
27 u = 243
1 u = 243 ÷ 27 = 9
Number of pens that Sarah has
= 7 u
= 7 x 9
= 63
Answer(s): 63