121. If x : y = 4 : 15 then the value of $$\left( {\frac{{x - y}}{{x + y}}} \right)$$ is?
122. If (x - 3)2 + (y - 5)2 + (z - 4)2 = 0, then the value of $$\frac{{{x^2}}}{9}{\text{ + }}\frac{{{y^2}}}{{25}}{\text{ + }}\frac{{{z^2}}}{{16}}$$ is?
123. x varies inversely as square of y. Given that y = 2 for x = 1, the value of x for y = 6 will equal to?
124. If a2 + b2 + c2 + 3 = 2(a - b - c), then the value of 2a - b + c is?
125. If $$\frac{{4x}}{3} + {\text{2P}} = 12$$ for what value of P, x = 6?
126. $${\text{The value of }}\frac{{4 + 3\sqrt 3 }}{{7 + 4\sqrt 3 }}{\text{ is?}}$$
127. a = $$\sqrt 6 \,$$ - $$\sqrt 5 $$ , b = $$\sqrt 5 \,$$ - 2, c = 2 - $$\sqrt 3 $$ then point out the correct alternative among the four alternatives given below ?
128. If $$x = 5 - \sqrt {21} {\text{,}}$$ then the value of $$\frac{{\sqrt x }}{{\sqrt {32 - 2x} - \sqrt {21} }}$$ is?
129. The value of $${\left( {{x^{b + c}}} \right)^{b - c}}$$ $$ \times $$ $${\left( {{x^{c + a}}} \right)^{c - a}}$$ $$ \times $$ $${\left( {{x^{a + b}}} \right)^{a - b}}$$ is?
130. If $$\frac{x}{a} = \frac{1}{a} - \frac{1}{x}{\text{,}}$$ then the value of x - x2 is?
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