Adam earns $4 for every car he washes.
He gets $6 bonus for every 3 cars he washes.

1. How much will Adam earn if he washes every 3 cars?   
2. If Adam wants to earn $22, how many cars must he wash? 
3. If Adam wants to earn $36, how many cars must he wash? 
4. If Adam wants to earn $62, how many cars must he wash? 

(a)
Amount that Adam will earn for washing every 3 cars
= 4 x 3 + 6
= $18

(b)
Number of sets of $18
= 22 ÷ 18
= 1 r 4

Number of cars in 1 set
= 1 x 3
= 3

Number of extra cars that he has to wash
= 4 ÷ 4
= 1

Total number of cars that Adam must wash
= 3 + 1
= 4

(c)
Number of sets of $18
= 36 ÷ 18
= 2 (Note that there is no remainder.)

Total number of cars that Adam must wash
= 2 x 3
= 6

(d)
If Adam wants to earn $62, how many cars must he wash?

Number of sets of $62
= 62 ÷ 18
= 3 r 8

Number of cars in 3 sets
= 3 x 3
= 9

Number of extra cars that he has to wash
= 8 ÷ 4
= 2

Total number of cars
= 9 + 2
= 11

Answer(s): (a) $18; (b) 4; (c) 6; (d) 11