31.
The number that is to be added to 10% of 320 to have the sum as 30% of 230 is :

32.
25% of 120 + 40% of 380 = ? of 637

33.
A number, on subtracting 15 from it reduces to its 80%. What is 40% of the number ?

34.
If 35% of A's income is equal to 25% of B's income, then the ratio of A's income to B's income is :

35.
If y% of one hour is, 1 minute 12 seconds, then y is equal to :

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