exam Maths Puzzle Numerical Ability

The sum of two numbers is 38. Their difference is 10. What are the two numbers?

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exam Other Question

What's the y-intercept of : 3x - y = -15? Please answer this question. I do not know how to solve a problem to the -2/3 power. What is the answer to 27^(-2/3) (-2/3) being the exponent