Adam earns $3 for every car he washes.
He gets $2 bonus for every 5 cars he washes.
- How much will Adam earn if he washes every 5 cars?
- If Adam wants to earn $23, how many cars must he wash?
- If Adam wants to earn $51, how many cars must he wash?
- If Adam wants to earn $60, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 5 cars
= 3 x 5 + 2
= $17
(b)
Number of sets of $17
= 23 ÷ 17
= 1 r 6
Number of cars in 1 set
= 1 x 5
= 5
Number of extra cars that he has to wash
= 6 ÷ 3
= 2
Total number of cars that Adam must wash
= 5 + 2
= 7
(c)
Number of sets of $17
= 51 ÷ 17
= 3 (Note that there is no remainder.)
Total number of cars that Adam must wash
= 3 x 5
= 15
(d)
If Adam wants to earn $60, how many cars must he wash?
Number of sets of $60
= 60 ÷ 17
= 3 r 9
Number of cars in 5 sets
= 3 x 5
= 15
Number of extra cars that he has to wash
= 9 ÷ 3
= 3
Total number of cars
= 15 + 3
= 18
Answer(s): (a) $17; (b) 7; (c) 15; (d) 18