SOLUTION: We need help solving this word problem: You rent a mountain bike & helmet for $10/hr; if you have your own helmet, $7/hr; or you can buy a helmet for $28. How many hours do you

Question 106622: We need help solving this word problem:
You rent a mountain bike & helmet for $10/hr; if you have your own helmet, $7/hr; or you can buy a helmet for $28. How many hours do you need to use the trail to justify buying the helmet?
This is what we did to solve the problem:
10 - 7 * X = 28
3x = 28
we divided each side by 3 and ended up with with a decimal
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
You rent a mountain bike & helmet for $10/hr; if you have your own helmet, $7/hr; or you can buy a helmet for $28. How many hours do you need to use the trail to justify buying the helmet?
-------------------
Let "x" be the number of hours on the trail.
1st: If you buy your own helmet Total Cost = (28 + 7x) dollars
-------------
2nd: If you rent helmet and trail time: Total Cost = 10x
------------------------
INEQUALITy:
Buy helmet cost < Rent helmet
28+7x < 10x
3x >28
x > 9 1/3 hours.
=============================
You have it right.
=============================
Cheers,
Stan H.

RELATED QUESTIONS
"You live near a mountain bike trail. You can rent a mountain bike and a safety helmet... (answered by richwmiller)

Your friend invites you to go to an indoor skateboard park. You'd like to go, but since... (answered by Alan3354)

I just don't get it! I have this problem to solve; suppose you can rent a pressure... (answered by jorel1380)

Jason bought a racing bike helmet and gloves. The helmet cost each h dollars. The bike... (answered by solver91311)

Hi. I hope that you can help me. I have talked to others in my class, and we are all... (answered by scott8148)

Write a formula that will help you determine your total cost. Let's let h = helmet... (answered by Alan3354)

if you bike a distance of 10 km at 30 km/hr, and then return at 20 km/hr, what is the... (answered by josgarithmetic)

I am trying to solve this problem and unfortunately, I am self-teaching myself so I don't (answered by math_tutor2020,ikleyn)

Good Day, I really need your help in solving this problem: It takes Robert 9 hr... (answered by TimothyLamb)