Adam earns $3 for every car he washes.
He gets $5 bonus for every 3 cars he washes.
- How much will Adam earn if he washes every 3 cars?
- If Adam wants to earn $20, how many cars must he wash?
- If Adam wants to earn $42, how many cars must he wash?
- If Adam wants to earn $48, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 3 cars
= 3 x 3 + 5
= $14
(b)
Number of sets of $14
= 20 ÷ 14
= 1 r 6
Number of cars in 1 set
= 1 x 3
= 3
Number of extra cars that he has to wash
= 6 ÷ 3
= 2
Total number of cars that Adam must wash
= 3 + 2
= 5
(c)
Number of sets of $14
= 42 ÷ 14
= 3 (Note that there is no remainder.)
Total number of cars that Adam must wash
= 3 x 3
= 9
(d)
If Adam wants to earn $48, how many cars must he wash?
Number of sets of $48
= 48 ÷ 14
= 3 r 6
Number of cars in 3 sets
= 3 x 3
= 9
Number of extra cars that he has to wash
= 6 ÷ 3
= 2
Total number of cars
= 9 + 2
= 11
Answer(s): (a) $14; (b) 5; (c) 9; (d) 11