Adam earns $4 for every car he washes.
He gets $3 bonus for every 3 cars he washes.
- How much will Adam earn if he washes every 3 cars?
- If Adam wants to earn $23, how many cars must he wash?
- If Adam wants to earn $45, how many cars must he wash?
- If Adam wants to earn $49, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 3 cars
= 4 x 3 + 3
= $15
(b)
Number of sets of $15
= 23 ÷ 15
= 1 r 8
Number of cars in 1 set
= 1 x 3
= 3
Number of extra cars that he has to wash
= 8 ÷ 4
= 2
Total number of cars that Adam must wash
= 3 + 2
= 5
(c)
Number of sets of $15
= 45 ÷ 15
= 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 $49, how many cars must he wash?
Number of sets of $49
= 49 ÷ 15
= 3 r 4
Number of cars in 3 sets
= 3 x 3
= 9
Number of extra cars that he has to wash
= 4 ÷ 4
= 1
Total number of cars
= 9 + 1
= 10
Answer(s): (a) $15; (b) 5; (c) 9; (d) 10