31.
If a = b × $$\frac{{d}}{{c}}$$; b, c and d are increased by 10%, then by how much does a increase ?

32.
Kamal has 160 toffees. He gave 5% toffees to Ravi, 15% toffees to Anita and one-fourth of the toffees to Gagan. How many toffees are left with Kamal after the distribution ?

33.
If a is 60% of b, then what percent of 4a is 5b ?

34.
Solve this :
(0.85% of 405) + (2.25% of 550) = ?

35.
An alloy of gold and silver weight 50 g. It contains 80% gold. How much gold should be added to the alloy so that percentage of gold is increased to 90 ?

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