Ethan, Riordan and Billy sold some notebooks. Billy sold 20% of the total number of notebooks sold by Riordan and Ethan. Ethan sold 25% of the total number of notebooks sold by Riordan and Billy. Ethan sold 65 less notebooks than Riordan. Find the total number of notebooks sold by all the boys.
| Ethan |
Riordan |
Billy |
Total |
| 5x5 |
1x5 |
6x5 |
| 1x6 |
4x6 |
5x6 |
| 6 u |
19 u |
5 u |
30 u |
20% =
20100 =
15 25% =
25100 =
14 The total number of notebooks is repeated. Make the total number of notebooks the same. LCM of 6 and 5 is 30.
Number of less notebooks that Ethan sold than Riordan
= 19 u - 6 u
= 13 u
13 u = 65
1 u = 65 ÷ 13 = 5
Total number of notebooks sold
= 30 u
= 30 x 5
= 150
Answer(s): 150
