A number when subtracted from 5 times of 64, the result obtained is 4 less than 8 times the number. Find the number.
1). 28
2). 36
3). 42
4). 54
Let the number be ‘x’
⇒ (5 × 64) - x = 8x - 4
⇒ 8x + x = 320 + 4
⇒ 9x = 324
⇒ x = 324/9 = 36
∴ The number is 36
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7. If x+$\frac{1}{x}$ =5, then the value of $\frac{5x}{x^{2}+5x+1}$ is
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10. If \(x = \sqrt {6\; + \sqrt {6\; + \sqrt {6\; + \; \ldots } } }\) then x is equal to