Problem solving ( show your calculation step)

A number consists of 3 digits whose sum is 10. The middle digit is equal to the sum of the other two and the number will be increased by 99 if these two digits are reversed. What is the number?

Solve the following mathematical problems:

Nipu sold 100 pens of which 50 are red and 50 are black, at tk. 48 per pen. He made a profit of 20% on the blank pens and made a loss of 20% red pens. What was the net gai or net loss on this sale in Tk?

Solve the following mathematical problems:

A trader purchases blue paint and yellow paint at a price of Tk. 110 and Tk. 100 per liter respectively . He mixes blue and yellow paint at a ratio of 1:21 to make a certain paint of green color. He sells the green pair at a price of Tk. 120 per liter. If the trader makes a profit of Tk. 2000, how much yellow paint (in kg) did he use in the mixture?

Solve the following mathematical problems:

In a class of 25 students , 10 have less than 6 marbles, 10 have more than 7 marbles and 4 have more than 8 marbles. How many students have more than 5 marbles but less than 9 Marbles?

Problem Solving (Show your calculations/steps)

The sum of two digits of a number is 16. If the digits of this number are interchanged, then the new number that we get is 18 greater than the original number. What is the original two-digit number?

Solve the following mathematical problems:

A ship with a faulty engine sailed for only 7 hours over a period of 2 days and covered a distance of 59 kms. It average speed on the first day was 5 km per hour slower than that on the second day. But it sailed 3 hours longer on the first day than that on the second day. What was its average speed on the second day?