Let <em>x</em> and <em>y</em> be the required amounts of the 35% and 60% acid solutions, respectively.
<em>x</em> liters of 35% acid solution contains 0.35<em>x</em> L of acid.
<em>y</em> liters of 80% acid solution contains 0.80<em>y</em> L of acid.
Together, a combined (<em>x</em> + <em>y</em>) L of mixed solutions contains (0.35<em>x</em> + 0.80<em>y</em>) L of acid.
You want to end up with 60 L of 65% acid solution, which means
<em>x</em> + <em>y</em> = 60
0.35<em>x</em> + 0.80<em>y</em> = 0.65 × 60 = 39
Solve for <em>x</em> and <em>y</em> :
<em>y</em> = 60 - <em>x</em>
0.35<em>x</em> + 0.80 (60 - <em>x</em>) = 39
0.35<em>x</em> + 48 - 0.80<em>x</em> = 39
0.45<em>x</em> = 9
<em>x</em> = 20
<em>y</em> = 40
Answer:
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Step-by-step explanation:
Answer:
First option: 
Step-by-step explanation:
Multiply both sides by y:
Answer:
The area of a rectangle can be found by multiplying it's length by the height of the rectangle.
Step-by-step explanation:
It is 500% because it is increased by 5 times.
