book Maths Puzzle Numerical Ability

make up a word problem that you can solve using a linear system with solution of(5,35)

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please help me solve this equation: {{{which of the following are the factors of m^2-14m=48?}}} Please help with this.

If you mix 8 liters of a 40% solution of acid with some 70% solutions to get a mixture that is a 50% solution. How much of the 70% solution would be used?