exam Maths Puzzle Numerical Ability

Ricardo is 4 years less than twice as old as his sister. The sum of their ages is 20. How old is Ricardo?

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exam Other Question

whats the square root of 10,000 times 2 times 50 The length of a rectangle is 2in. more than twice it's width. If the perimeter of the rectangle is 52in., find the width of the rectangle.