exam Maths Puzzle Numerical Ability

1. How many liters of a 50% solution should be added to a 80% solution to obtain a 60% solution?

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exam Other Question

i don't think it is possible to get a ratio of a teacher that is 0.5... you presented a problem 120330.. refer to this problem... there isn't such thing as a half teacher!!!!! my m Can someone please help me solve this equation?
Write equation of line that passes through point (4,-9) with slope of -4.

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