exam Maths Puzzle Numerical Ability

Solve the system by substitution.
x + y = 12
y = 2x

Solve the system by addition.
5x - 3y = 13
4x - 3y = 11

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exam Other Question

Solve the problem. It takes 11 hours for 6 people to paint a house. How long will it take 2 people to do the job? The relative density of an object may be defined as its weight in air Wa, divided by the difference of its weight in air and its weight when submerged in water, Ww. For a lead weight, Wa = 1.097 Ww. Find the relative density of lead.