exam Maths Puzzle Numerical Ability

A ladder 25 ft. long (AD) is leaning against a wall, reaching a point 20 ft. above the ground (CD). The ladder is then moved so that AB= 2(DE). Find BC.

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exam Other Question

The question is: find three consecutive intengers whose sum is 11 less than 5 times the smallest of the three.

I think the equation would be x+y+z=5x-11 but how do I solve it?

Help! Please help with (9a/4b)^0. Is it 9a/4b or 1?