Question

I'm just stuck on where I need to start.
I know the rest

Answer 1

40% of 300

=300×(40/100)  

  [As40 percent means 40 out of hundred, so we need to                 multiply the fraction]

=3×40

=120

40% of 300 =120 So 120 students choose conserving natural resources.

2.

Now 24% choose conserving natural resources ,

24% of 300

=300(24/100)

=3×24

=72

So 72 students choose conserving natural resources.