book Maths Puzzle Numerical Ability

. Solve the following system by substitution.
8x - 4y = 16
y = 2x - 4

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book Other Question

math099 find two consecutive odd integers such that twice the square of the first plus the square of the second totals ninety-nine. Diane can paint a house in 8 hours. Anne can paint a house in 10 hours. What is the fraction that they paint the house together in 2 hours?