Adam earns $2 for every car he washes.
He gets $6 bonus for every 5 cars he washes.
- How much will Adam earn if he washes every 5 cars?
- If Adam wants to earn $20, how many cars must he wash?
- If Adam wants to earn $32, how many cars must he wash?
- If Adam wants to earn $38, how many cars must he wash?
(a)
Amount that Adam will earn for washing every 5 cars
= 2 x 5 + 6
= $16
(b)
Number of sets of $16
= 20 ÷ 16
= 1 r 4
Number of cars in 1 set
= 1 x 5
= 5
Number of extra cars that he has to wash
= 4 ÷ 2
= 2
Total number of cars that Adam must wash
= 5 + 2
= 7
(c)
Number of sets of $16
= 32 ÷ 16
= 2 (Note that there is no remainder.)
Total number of cars that Adam must wash
= 2 x 5
= 10
(d)
If Adam wants to earn $38, how many cars must he wash?
Number of sets of $38
= 38 ÷ 16
= 2 r 6
Number of cars in 5 sets
= 2 x 5
= 10
Number of extra cars that he has to wash
= 6 ÷ 2
= 3
Total number of cars
= 10 + 3
= 13
Answer(s): (a) $16; (b) 7; (c) 10; (d) 13