exam Maths Puzzle Numerical Ability

How many liters of a 10% alcohol solution must be mixed with 70 liters of a 90% solution to get a 30% solution?

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True or false and why?

A parallelogram whose diagonals are congruent and perpendicular is a rhombus. a truck traveling at a constant rate of 45mph .one hour later a car traveling at a rate 60mph same direction on highway.howlong will it take for the car to catch up to the truck, if both vehicles continue in same direction?