book Maths Puzzle Numerical Ability

When finding the Surface area of a Right circular cylinder, hiow do I find the Base Area?

SA= 2(BA)+ ph

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book Other Question

How many kilogram of fine glucose must be added to 25 kilograms of a 12% sweetened juice concentrate to prepare instead a light syrup 20% sweet?

I can't solve this problem. I ne Simplify: -√[121] + (-1)^3