Question

Tom knows that in his school 10 out of every 85 students are left-handed. There are 391 students in Tom's school. How many students in Tom's school are left-handed?

Answer 1

Number of left-handed students in his school s `46`

Explanation:

As Tom has `10` out of every `85` students in his school as left-handed, this is equivalent to

`10/85=(2xx5)/(17xx5)=2/17`

i.e. `2` out of every `17` students in his school are left-handed.

Hence out of `391` students, number of left-handed students are

`391xx2/17=23xx17xx2/17=23xxcancel17xx2/(1cancel17)=23xx2=46`