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If (64)2 - (36)2 = 20 × x, then x = ?
Answer & Solution
Correct Answer:
Option
D
$$\eqalign{
& 20 \times x = \left( {64 + 36} \right)\left( {64 - 36} \right) \cr
& 20 \times x = 100 \times 28 \cr
& \therefore {\kern 1pt} x = \frac{{100 \times 28}}{{20}} \cr
& \,\,\,\,\,\,\,\,\,\,\, = 140 \cr} $$
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