Adam earns $2 for every car he washes.
He gets $4 bonus for every 3 cars he washes.
- How much will Adam earn if he washes every 3 cars?
- If Adam wants to earn $12, how many cars must he wash?
- If Adam wants to earn $20, how many cars must he wash?
- If Adam wants to earn $32, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 3 cars
= 2 x 3 + 4
= $10
(b)
Number of sets of $10
= 12 ÷ 10
= 1 r 2
Number of cars in 1 set
= 1 x 3
= 3
Number of extra cars that he has to wash
= 2 ÷ 2
= 1
Total number of cars that Adam must wash
= 3 + 1
= 4
(c)
Number of sets of $10
= 20 ÷ 10
= 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 $32, how many cars must he wash?
Number of sets of $32
= 32 ÷ 10
= 3 r 2
Number of cars in 3 sets
= 3 x 3
= 9
Number of extra cars that he has to wash
= 2 ÷ 2
= 1
Total number of cars
= 9 + 1
= 10
Answer(s): (a) $10; (b) 4; (c) 6; (d) 10