56.
In a bag, there are coins of 25 p, 10 p and 5 p in the ratio of 1 : 2 : 3. If there is Rs. 30 in all, how many 5 p coins are there?

57.
What is the ratio in Rs. 2.80 and 40 paise?

58.
A person spends Rs. 8100 in buying some tables at Rs. 1200 each and some chairs at Rs. 300 each. The ratio of the number of chairs to that of tables when the maximum possible number of tables is purchased,

59.
If $$x = \frac{1}{3}y$$   and $$y = \frac{1}{2}z{\text{,}}$$   then x : y : z is equal to = ?

60.
If x : y = 3 : 1, then x3 - y3 : x3 + y3 = ?

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