21. The ratio of the first and second class fares between two railway stations is 4 : 1 and that of the number of passengers travelling by first and second classes is 1 : 40. If on a day Rs. 1100 are collected as total fare, the amount collected from the first class passengers is = ?
22. If a : (b + c) = 1 : 3 and c : (a + b) = 5 : 7, then b : (a + c) is equal to.
23. If a : b = 3 : 4, b : c = 4 : 7, then $$\frac{{a + b + c}}{c}$$ is equal to -
24. If A : B : C = 2 : 3 : 5 and A = x% of (B + C), then x is equal to -
25. If a and b are rational numbers and $$a + b\sqrt 3 $$ $$ = $$ $$\frac{1}{{2 - \sqrt 3 }}{\text{,}}$$ then a : b is equal to = ?
26. If A : B = 3 : 4 and B : C = 8 : 9, then A : B : C is = ?
27. If 2A = 3B = 4C, the A : B : C is = ?
28. x, y, z, u are real numbers such that x : y = y : z = z : u and x : u = 64 : 27. the value of x : z is -
29. If p : q : r = 1 : 2 : 4, then $$\sqrt {5{p^2} + {q^2} + {r^2}} $$ is equal to -
30. If A : B : C = 2 : 3 : 4, then the ratio $$\frac{{\text{A}}}{{\text{B}}}$$ : $$\frac{{\text{B}}}{{\text{C}}}$$ : $$\frac{{\text{C}}}{{\text{A}}}$$ is equal to -
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