Adam earns $4 for every car he washes.
He gets $5 bonus for every 4 cars he washes.
- How much will Adam earn if he washes every 4 cars?
- If Adam wants to earn $25, how many cars must he wash?
- If Adam wants to earn $42, how many cars must he wash?
- If Adam wants to earn $54, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 4 cars
= 4 x 4 + 5
= $21
(b)
Number of sets of $21
= 25 ÷ 21
= 1 r 4
Number of cars in 1 set
= 1 x 4
= 4
Number of extra cars that he has to wash
= 4 ÷ 4
= 1
Total number of cars that Adam must wash
= 4 + 1
= 5
(c)
Number of sets of $21
= 42 ÷ 21
= 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 $54, how many cars must he wash?
Number of sets of $54
= 54 ÷ 21
= 2 r 12
Number of cars in 4 sets
= 2 x 4
= 8
Number of extra cars that he has to wash
= 12 ÷ 4
= 3
Total number of cars
= 8 + 3
= 11
Answer(s): (a) $21; (b) 5; (c) 8; (d) 11