If 12a + 3b =1 and 7b-2a=9, what is the average of a and b?

If the salary of an employee is reduced by 10 percent for his late attendance and then increased by 10 percent...

35% of Nabila's income is equal to 25% of Nuru's income. The ratio of their income is

The simple interest on a sum of money will be Tk. 600 after 10 years . If the principal is trebled after 5 yea...

A man spent of his money and then lost of the remainder . He was left with Tk. 3,600 . How much did he start w...

In a class of 78 students 14 are taking French , 22 are taking German . Of the students taking French or Germa...