Ken, Luis and Mark sold some pens. Mark sold 30% of the total number of pens sold by Luis and Ken. Ken sold 25% of the total number of pens sold by Luis and Mark. Ken sold 216 less pens than Luis. Find the total number of pens sold by all the boys.
| Ken |
Luis |
Mark |
Total |
| 10x5 |
3x5 |
13x5 |
| 1x13 |
4x13 |
5x13 |
| 13 u |
37 u |
15 u |
65 u |
30% =
30100 =
310 25% =
25100 =
14 The total number of pens is repeated. Make the total number of pens the same. LCM of 13 and 5 is 65.
Number of less pens that Ken sold than Luis
= 37 u - 13 u
= 24 u
24 u = 216
1 u = 216 ÷ 24 = 9
Total number of pens sold
= 65 u
= 65 x 9
= 585
Answer(s): 585
