exam Maths Puzzle Numerical Ability

find all the factors of 48 then classify 48 as primee or composite

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exam Other Question

please tell me how to solve this problem step by step and how do I solve it ?

12x + 1
and also
5x + 2 A liter of fluid is 50% alcohol. How much water must be added to dilute it to a 20% solution?

my work: so x is the amount of water to be added.
so something + x should = .20??