71. If $$\sqrt {0.03 \times 0.3a} $$ = $${\text{0}}{\text{.3}} \times {\text{0}}{\text{.3}} \times \sqrt b {\text{,}}$$ value of $$\frac{a}{b}\,{\text{is?}}$$
72. If x * y = (x + 3)2 (y - 1), then the value of 5 * 4 is?
73. $${\text{If }}\sqrt {1 + \frac{x}{{961}}} = \frac{{32}}{{31}}{\text{,}}$$ then the value of x is?
74. If $$\sqrt {0.04 \times 0.4 \times a} $$ = 0.004 × 0.4 × $$\sqrt b ,$$ then the value of $$\frac{a}{b}\,{\text{is?}}$$
75. If $$\frac{a}{b} = \frac{c}{d} = \frac{e}{f} = 3,$$ then $$\frac{{2{a^2} + 3{c^2} + 4{e^2}}}{{2{b^2} + 3{d^2} + 4{f^2}}}$$ = ?
76. If x varies inversely as (y2 - 1) and x is equal to 24 when y = 10, then the value of x when y = 5 is?
77. If x2 + y2 + 2x + 1 = 0, then the value of x31 + y35 is?
78. If a, b, c are real and a2 + b2 + c2 = 2(a - b - c) -3, then the value of 2a - 3b + 4c is?
79. If (3a + 1)2 + (b - 1)2 + (2c - 3)2 = 0 then the value of (3a + b + 2c) is equal to?
80. The value of the expression $$\frac{{{{\left( {a - b} \right)}^2}}}{{\left( {b - c} \right)\left( {c - a} \right)}} + $$ $$\frac{{{{\left( {b - c} \right)}^2}}}{{\left( {a - b} \right)\left( {c - a} \right)}} + $$ $$\frac{{{{\left( {c - a} \right)}^2}}}{{\left( {a - b} \right)\left( {b - c} \right)}}$$ = ?
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