exam Maths Puzzle Numerical Ability

How do I solve by using two equations in two variables?

Larry is 8 years older than his sister. In 3 years, he will be twice as old as she is now. How old are they now?

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exam Other Question
In a race , Mary is 50 ft. in front of Susie after 10 seconds. How fast can Mary run if Susie runs 20 ft per second? How do you interpret the solution of a system of equations by the corresponding graph?