A rectangular field is to be fenced on three sides leaving a side of 20 feet uncovered. If the area of the field is 680 square feet, how many feet of fencing is required?

Solve the following problem:

Amin has 12 pieces of Tk. 10 and Tk. 5 notes in his wallet. If the total value of all the notes is less than Tk. 95, what is the maximum number of Tk. 10 notes that he has?

Solve the following problem:

A, B and C enter into partnership. A invests 3 times as much as B invests and B invests two- third of what C invests. At the end of the year, the profit earned is Tk. 6,600. What is the share of B?

Solve the following problem:

A and B can complete a work in 15 days and 10 days respectively. They started doing the work together but after 2 days B had to leave and A alone completed the remaining work. The whole work was completed in how many days?

Solve the following problem:

The percentage profit earned by selling an article for Tk. 1,920 is equal to the percentage loss incurred by selling the same article for Tk. 1,280. At what price should the article be sold to make 25% profit?

Solve the following problem:

What will be the deposited amount at initial stage, if it became to Tk. 33,500 at the end of 5 years, with a simple interest rate of 13.5% per annual? How many years is will take to become Tk. 40,600 of the same deposited amount?