Justin, Daniel and Tommy sold some notebooks. Tommy sold 40% of the total number of notebooks sold by Daniel and Justin. Justin sold 20% of the total number of notebooks sold by Daniel and Tommy. Justin sold 112 less notebooks than Daniel. Find the total number of notebooks sold by all the boys.
| Justin |
Daniel |
Tommy |
Total |
| 5x6 |
2x6 |
7x6 |
| 1x7 |
5x7 |
6x7 |
| 7 u |
23 u |
12 u |
42 u |
40% =
40100 =
25 20% =
20100 =
15 The total number of notebooks is repeated. Make the total number of notebooks the same. LCM of 7 and 6 is 42.
Number of less notebooks that Justin sold than Daniel
= 23 u - 7 u
= 16 u
16 u = 112
1 u = 112 ÷ 16 = 7
Total number of notebooks sold
= 42 u
= 42 x 7
= 294
Answer(s): 294
