exam Maths Puzzle Numerical Ability

please help me solve this problem
4^n=32^n-1

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exam Other Question

verify the identity:
(sinx+cosx+1)/(sinx+cosx-1) = cscxsecx + cscx + secx + 1

Please prove this identity. Thank you. How much water must be evaporated from 32 ounces of a 4% salt solution to make a 6% salt solution?