If your information is for a percentage out of every 85, you need the total number divided by the 85:
391 students / out of 85
= 391 / 85
= 4.6
But in every 85, (of which there are 4.6), 10 of them are left handed (not 4.6 of them)
So multiply the 4.6 by the ten left handed students:
4.6 x 10
= 46
Therefore there are 46 left handed students in Tom's school
The factors of 42 are: 1,2,3,6,7,14,21,42
Many maybe?? not so sure :C
