Adam earns $2 for every car he washes.
He gets $2 bonus for every 4 cars he washes.
- How much will Adam earn if he washes every 4 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 $36, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 4 cars
= 2 x 4 + 2
= $10
(b)
Number of sets of $10
= 12 ÷ 10
= 1 r 2
Number of cars in 1 set
= 1 x 4
= 4
Number of extra cars that he has to wash
= 2 ÷ 2
= 1
Total number of cars that Adam must wash
= 4 + 1
= 5
(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 4
= 8
(d)
If Adam wants to earn $36, how many cars must he wash?
Number of sets of $36
= 36 ÷ 10
= 3 r 6
Number of cars in 4 sets
= 3 x 4
= 12
Number of extra cars that he has to wash
= 6 ÷ 2
= 3
Total number of cars
= 12 + 3
= 15
Answer(s): (a) $10; (b) 5; (c) 8; (d) 15