exam Maths Puzzle Numerical Ability

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

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How do I solve using two equations and two variables?

The tens digit of a two-digit number is twice the units digit. If the digits are reversed, the new number is 36 less than the original number. Find the number. 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?