exam Maths Puzzle Numerical Ability

How many liters of a blue dye that costs $1.80 per liter must be mixed with 20 L of Anil, which costs $2.60 per liter, to make a mixture that costs $2.12 per liter?

A. 30 L
B. 25 L
C. 20 L
D. 15 L

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exam Other Question

The sum of the measures of the angles of a triangle is 180*. Find the measure missing. Angles given are 45 and 35 degrees. Is the correct angle 100???? Let f(x)=√(x+3 (sqrt(x+3) )and g (x)=x^2 )-1.Find fog and gof.