Question

1. The Mathematics Club of SBHS is holding their annual car wash to raise funds for club projects. Erika can
wash and wax one car in 5 hours. Romy can wash and wax one car in 4 hours. If Erika and Romy work
together, how long will it take them to wash and wax one car?

Answer 1

Answer:

Down below

Step-by-step explanation:

\frac{t}{a} + \frac{t}{b} = 1

a

t

+

b

t

=1

\frac{t}{5} + \frac{t}{4} = 1

5

t

+

4

t

=1

20( \frac{t}{5} + \frac{t}{4} = 1)20(

5

t

+

4

t

=1)

4t + 5t = 204t+5t=20

9t = 209t=20

Answer 2

Answer:

time taken for Erika to wash and wax one car- 5hr

time taken by romy to wash and wax one car- 4hr

•the total time taken for washing ans waxing one car is 20hrs. into mixed fraction=2 2/9

9