exam Maths Puzzle Numerical Ability

Exercise 15 Geometry. A homeowner wishes to insulate her attic with fiberglass insulation to conserve energy. The insulation comes in 40-cm wide rolls that are cut to fit between t

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A soil analysis of a lawn determines 50 pounds of fertilizer containing 20 % nitrogen is needed. How can this mixture be made from two different fertilizers one containing 15 % nitrogen and the other containing 24% nitrogen? 1) 16 is 8% of what number?
2)4 (3)/(5) + 1(4)/(15) =
3)one solution of x^2-4x= 12 is
4)c/d +2 =