exam Maths Puzzle Numerical Ability

If 5 times the first number plus three times the second number eaguals 47, and 10 times the first number minus 4 times the second number equals 54, what are the numbers?

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exam Other Question

The speed of a boat in still water is 24mph. If the boat travels 54 miles upstream in the same time that it takes to travel 90 miles downstream, find the speed of the current. Write the quadratic equation with a lead coefficient of 1 whose roots are 1+3i and 1-3i.

Could someone show me how to this step-by-step, please?