The average pocket money of 3 friends A, B, C is Rs. 80 in a particular month. If B spends double and C spends triple of what A spends during that month and if the average of their unspent pocket money is Rs. 60, then A spends (in Rs.)

A number is divided into two parts in such a way that 80% of $1^{st}$part is 3 more than 60% of $2^{nd}$part and 80% of $2^{nd}$part is 6 more than 90% of the $1^{st}$part. Then the number is:

Two students appeared at an examination. One of them secured 9 marks more than the other and his marks were 56% of the sum of their marks. The marks obtained by them are:

A shopkeeper earns a profit of 10% after allowing a discount of 20% on the marked price. The cost price of the article whose marked price is Rs. 880 is:

A person invests money in three different schemes for 6 years, 10 years and 12 years at 10 percent 12 percent and 15 percent simple interest respectively. At the completion of each scheme, he gets the same interest. The ratio of his investments is:

x number of men can finish a piece of work in 30 days. If there were 6 men more, the work could be finished in 10 days less. The original number of men is: