Vincent, Mark and Billy sold some notebooks. Billy sold 20% of the total number of notebooks sold by Mark and Vincent. Vincent sold 25% of the total number of notebooks sold by Mark and Billy. Mark sold 98 more notebooks than Billy. Find the total number of notebooks sold by all the boys.
| Vincent |
Mark |
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 more notebooks that Mark sold than Billy
= 19 u - 5 u
= 14 u
14 u = 98
1 u = 98 ÷ 14 = 7
Total number of notebooks sold
= 30 u
= 30 x 7
= 210
Answer(s): 210
