Quantitative Aptitude - Arithmetic Ability Questions

If Cos θ = 15/17 , then what is the value of Cosec θ?

A and B together do a job in 6.75 days and A could do the job in 9 days if he worked alone. How many days would B take to do the job if he worked alone?

S does half as much work as T in 1/7 of the time taken by T. If together they take 21 days to complete a work, then how may days shall S take to complete that work alone?

A can paint a house in 45 days and B can do it in 15 days. Along with C, they did the job in 5 days only. Then, C alone can do the job in how many days?

The marked price of an article is 10/7 of the cost price and the selling price of that article is 4/5 of the marked price. What is the profit percentage?

A bag has Rs.51.25 in the form of 2-rupee, 50-paise and 25-paise coins in the ratio of 3:5:7. What is the total number of 50-paise coins?

Two numbers are more than the third number by 16.25% and 55% respectively. First number is what percentage of the second number?

The volume of a spherical balloon is increased by 700%. What is the percentage increase in its surface area?