exam Maths Puzzle Numerical Ability

Jon has a 26-ft ladder leaning against his house.If the bottom of the ladder is 10 ft. from the base of the house, how high does the ladder reach.

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Here is my problem: Twice what number is equal to three times that number? Thank you Lisa Which of the following equations describe the same line as the equation 1/2x-5y=1?
(a) 2x-1/5y=1
(b) x=5y+2
(c) 2-5x+10y=0
(d) y=.1(x-2)
(e) 10y-x= -2
(f) 1+.5x=2+5y