book Maths Puzzle Numerical Ability

The perimeter of a rectangular floor is 42 feet, and the area is 108 square feet. Find the length of the floor.

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book Other Question

{{{ 3(-2 - 3x)= -9x 4 }}}

and

{{{1/2 (6-z)=z }}}

and

{{{6+2(3j-2)= 4(1=j)
Let p be prime. Prove that...

(1 + p)^(p^(n - 1)) = 1(mod p^n) for all n = 1, 2, 3,...

Would using the Binomial Thm help? What about applying the Chinese Remainder Thm?