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Question 195
If a number is multiplied by two-third of itself the value so obtained is 864. What is the number?
Solution
Let the number be a.
$$a\times a\times\frac{2}{3}$$=864
$$a^{2}\times\frac{2}{3}$$=864
$$a^{2}$$=$$864\times\frac{3}{2}$$
$$a^{2}$$=1296
$$a=36$$
Hence Option C is the correct answer.
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