exam Maths Puzzle Numerical Ability

What percent of 40 is 25

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exam Other Question

a dead tree was struck by lightening causing it to fall over at a point 10ft up from the base of the tree.
if the fallen treetop forms a 40 degree angle with the ground, about how tall was the tree originally?
I am having a serious problem with this expression. The problem is to simplify and combine like radicals.All variables represent positive numbers.The problem is 8 to the sqrt of 3y