exam Maths Puzzle Numerical Ability

How do I solve using a system of two linear equations in two variables?

Barry is 8 years older than his sister. In 3 years, he will be twice as old as she will be then. How old is each now?

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exam Other Question

One grocery clerk can stock a shelf in 20 minutes, whereas a second clerk requires 30 minutes to stock the same shelf. If the two clerks worked together. how long would it take th Dr. Beaker invested $3000, part at 8% and the rest at 7 1/2%. The total return for one year was $231. How much was invested at each rate?