Question 1:
half the number n is

8 more means that we will add more
Therefore:
c =
+ 8
Question 2:
three fifth of b is

7 less means that we will subtract 7 from the given amount
This means that:
a =
- 7
Question 3:
the quotient of h and 3 means that we will divide h by 3 giving

2.5 more means that we will add 2.5
This means that:
w =
+ 3
Hope this helps :)