Problems based on Numbers Test 3

Question : 33 of 40

Marks: +1, -0

If the sum and difference of two numbers are 20 and 8 respectively. What is the difference of their squares?

Solution:

Let two numbers be x and y; then
x + y = 20 ...(i)
x - y = 8 ...(ii)

x^2 - y^2 = (x + y) (x - y)

= 20 × 8 = 160

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