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enyata [817]
3 years ago
7

Anjali's Bikes rents bikes for $15.24 plus $2.61 per hour. Kathryn paid $30.90 to rent a bike. For how many hours did she rent t

he bike?
Mathematics
2 answers:
tensa zangetsu [6.8K]3 years ago
7 0
Kathryn rented the bike for about 1.7 hours.
Novay_Z [31]3 years ago
7 0
Y = 2.61h + 15.24 would be the equation used to find the cost for any amount of hours.

30.90 = 2.61h + 15.24 Solve for h by subtracting 15.24 from both sides
15.66 = 2.61h Divide both sides by 2.61
6 = h
She rented the bike for 6 hours
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Let <em>q</em> be the number of quarts of pure antifreeze that needs to be added to get the desired solution.

8 quarts of 40% solution contains 0.40 × 8 = 3.2 quarts of antifreeze.

The new solution would have a total volume of 8 + <em>q</em> quarts, and it would contain a total amount of 3.2 + <em>q</em> quarts of antifreeze. You want to end up with a concentration of 60% antifreeze, which means

(3.2 + <em>q</em>) / (8 + <em>q</em>) = 0.60

Solve for <em>q</em> :

3.2 + <em>q</em> = 0.60 (8 + <em>q</em>)

3.2 + <em>q</em> = 4.8 + 0.6<em>q</em>

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<em>q</em> = 4

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