book Maths Puzzle Numerical Ability

If 3(4x+5(3.14))=P, then 6(8x+10(3.14))=

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book Other Question

Please help me with this.

Find the perimeter of the triangle if the three sides are:
4, sqrt 5 - sqrt 5, sqrt 5 + sqrt 5

Thanks Solve for x

1/x-5 + 1/x-12 = 1/x-17x+60

/ indicates fraction