exam Maths Puzzle Numerical Ability

Suppose Petra could not find her credit card bill and did not remember the amount of her bill. Could you still determine the cost of her items? Why or why not?

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exam Other Question

How do you tell wethere a triangle is a right triangle or not and how to give a reason.. for example here is a problem:

x=25 y=25 z=38 Write an algebraic equation for the english statement "subtract 5 from the sum of x and 7 times and the result is 20