Quantitative Aptitude - Arithmetic Ability Questions

If 27% of an electricity bill is deducted, Rs 1825 is still to be paid. How much was the bill?

70% of the cost price of a article is equal to the 40% of its selling price. What is the profit or loss percentage?

If Sin θ = 20/29, then what is the value of Cos θ?

A trader had 630 kgs of rice. He sold a part of it at 15% profit and the rest at 8% profit, so that he made a total profit of 12%. How much rice (in kgs) did he sell at 8% profit?

A trader had 16 quintals of wheat. He sold a part of it at 17% profit and the rest at 27% profit, so that he made a total profit of 21%. How much wheat did he sell at 27% profit?

S, T and U together can complete a work in 30 days. If the ratio of efficiency of S, T and U is 20 : 15 : 12 respectively, then in how many days U alone can complete the same work?

2/3 of a milk-water mixture was milk. There was 21 lit of the mixture. If 4 lit of water is added to it, the % of milk in the new mixture will be:

0.0245¯ written as a vulgar fraction in its simplest form = ?