<PRE><B>Question 928606</B>
x = ml of 4% = 70
y = ml of 10%
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4x + 10y =  8(x + y)
4x + 10y =  8x + 8y
2y = 4x
y = 2x
y = 2*70
y = 140
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answer:
add 140 ml of 10%
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