exam Maths Puzzle Numerical Ability

solve by substitution 5x-2y=-5
y-5x=3

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exam Other Question

Quadrilateral ABCD is in the shape of a kite. AB and AD are both 2 feet. BC and BC are both 3 feet. There is a line from A to C and another line from B to D. AC is 4 feet. What is the measure of the angle the 2-foot edge makes with the 3-foot edge? what is 1/4(7+3g)= -g/8