SOLUTION: Fifteen litres of fuel containing 3.2% oil is available for a certain two-cycle engine. This fuel is to be used for another engine requiring a 5.5% oil mixture. How many litres o

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Question 1055367: Fifteen litres of fuel containing 3.2% oil is available for a certain two-cycle engine. This fuel is to be used for another engine requiring a 5.5% oil mixture. How many litres of oil must be added?
Found 2 solutions by josgarithmetic, ikleyn:
Answer by josgarithmetic(39616)   (Show Source): You can put this solution on YOUR website!

Answer by ikleyn(52776)   (Show Source): You can put this solution on YOUR website!
.
Fifteen litres of fuel containing 3.2% oil is available for a certain two-cycle engine.
This fuel is to be used for another engine requiring a 5.5% oil mixture. How many litres of oil must be added?
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

The basic equation is 

 = 0.055.   (1)

To solve it, multiply both sides by (15 + v). You will get

15*0.032 + v = 0.055*(15+v),

0.48 + v = 0.825 + 0.055v,

v - 0.055v = 0.825-0.48,

0.945v = 0.345  --->  v =  = 0.365.

Answer.  0.365 liters of oil must be added.

Be aware: Writing by josgarithmetic on this problem is absolutely wrong starting from his first equation.


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