exam Maths Puzzle Numerical Ability

Use cross products to determine whether each of pair of ratios forms a proportion:

4/9, 12/27

Please explain how to solve this problem.

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exam Other Question

The length of a rectangle is 2ft less than three times the width of the triangle. The area of the rectangle is 65ft2. Find the length and width of the rectangle. If A is a 5 × 5 matrix, then AI^-1 =

a. A^-1
b. I
c. A
d. A^-1 I