71. A sum of Rs. 1240 is distributed among A, B and C such that the ratio of amount received by A and B is 6 : 5 and that of B and C is 10 : 9 respectively. Find the share of C ?
72. If x : 7.5 = 7 : 17.5, then the value of x is -
73. The value of $$x$$ where $$x$$ : $$2\frac{1}{3}$$ :: $$21$$ : $$50$$ is -
74. If $$\sqrt 2 $$ : $$\left( {1 + \sqrt 3 } \right)$$ :: $$\sqrt 6 $$ : $$x$$, then $$x$$ is equal to -
75. In an alloy, the ratio of copper and zinc is 5 : 2. If 1.250 kg of zinc is mixed in 17 kg 500 gm of alloy, then the ratio of copper and zinc will be = ?
76. The income of A, B and C are in the ratio 7 : 9 : 12 and their spending are in the ratio 8 : 9 : 15. If A saves $$\frac{1}{4}$$ th of his income then the savings of A, B and C are in the ratio of = ?
77. What will be the simplest form of the ratio 3 hours : 1 day?
78. In a proportion the product of 1st and 4th terms is 40 and that of 2nd and 3rd terms is 2.5x. Then the value of x is.
79. If 20% of A = 30% of B = $$\frac{1}{6}$$ of C, then A : B : C is -
80. Two numbers are in the ratio 17 : 45, One - third of the smaller is less than $$\frac{1}{5}$$ of the bigger by 15. The smaller number is = ?
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