book Maths Puzzle Numerical Ability

what is the area ofa traingle inside a circle of radius 5 ?

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book Other Question

The difference between 1/4 of a number and 1/6 of the same # is 18. Which equation shows the correct relationship?
1.1/4x-1/6x=18
2.1/4x=1/6x=18
3.1/4x+18=1/6x
4.1/6x-18+1/4x=18
5.1/6x-18=1/4x Can someone help me on this problem.
(Identify the rate, base and amount on this proble. do not solve it.)
In a shipment of 750 parts, 75 were found to be defective. What percent of the parts wer faulty?
Thanks,
Sher