Adam earns $4 for every car he washes.
He gets $4 bonus for every 4 cars he washes.
- How much will Adam earn if he washes every 4 cars?
- If Adam wants to earn $32, how many cars must he wash?
- If Adam wants to earn $60, how many cars must he wash?
- If Adam wants to earn $72, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 4 cars
= 4 x 4 + 4
= $20
(b)
Number of sets of $20
= 32 ÷ 20
= 1 r 12
Number of cars in 1 set
= 1 x 4
= 4
Number of extra cars that he has to wash
= 12 ÷ 4
= 3
Total number of cars that Adam must wash
= 4 + 3
= 7
(c)
Number of sets of $20
= 60 ÷ 20
= 3 (Note that there is no remainder.)
Total number of cars that Adam must wash
= 3 x 4
= 12
(d)
If Adam wants to earn $72, how many cars must he wash?
Number of sets of $72
= 72 ÷ 20
= 3 r 12
Number of cars in 4 sets
= 3 x 4
= 12
Number of extra cars that he has to wash
= 12 ÷ 4
= 3
Total number of cars
= 12 + 3
= 15
Answer(s): (a) $20; (b) 7; (c) 12; (d) 15