If sandy can decorate a cake in 3 hr and eric can decorate the same cake in 5 hr what is their hourly rate working together

we are given

sandy can decorate a cake in 3 hr

so,

In 1 hour , sandy can decorate

part of cake

Eric can decorate the same cake in 5 hr

so,

In 1 hour , sandy can decorate

part of cake

so, when they work together

In 1 hour , Sandy and Eric decorate

so, their hourly rate is

.............Answer

$25

step-by-step explanation:

25 - 4.50 = 20.5

20.5 / 2 = 10.25

10.25 + 10 = 20.25

20.25 - 12.50 = 7.75

therefore the answer is $25 as shown as the first number.