A box contains only marbles. If ¼ the marbles were removed, the box would be filled to 1/3 of its capacity. If instead 100 marbles were added, the box would be full. How many marbles are there in the box?

Minhaz and Alam can complete a work in 18 days . After working together for 12 days Minhaz stops and Alam competes the remaining work in 8 days. In how many days can Minhaz complete the work if he works alone?

একটি ট্রেন ঘণ্টায় ৪৫ কিলোমিটার বেগে চলে ১০০ মিটার দৈর্ঘ্যের একটি প্লাটফর্ম ১ মিনিটে অতিক্রম করলে ট্রেনটির দৈর্ঘ্য কত?

যে পরিমাণ খাদ্যে ২০০ জন লোকের ২০ সপ্তাহ চলে, ঐ পরিমাণ খাদ্যে কতজন লোকের ৮ সপ্তাহ চলবে?

শরীফের মাসিক বেতন মামুনের চেয়ে ২৫% বেশি হলে মামুনের শরীফের বেতনের চেয়ে শতকরা কতভাগ কম?

একটি ব্যাংকের একটি ব্রাঞ্চের ৬০% কর্মচারী পুরুষ। যদি কর্মচারীদের মধ্যে ৭০% পুরুষ এবং ৯০% মহিলা কনভোজনে অংশগ্রহণ করে, তবে ব্রাঞ্চের কর্মচারীর কত শতাংশ বনভোজনে অংশগ্রহণ করে?

একজন ফল বিক্রতা তার ক্রীত আপেলের ৩০% বিক্রি করার পর স্টকে আরও ৬৩০ টি আপেল অবশিষ্ট থাকল। তিনি কতগুলো আপেল ক্রয় করেছিলেন?

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?

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?

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?

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?

Average wight of ALam, Babul and Kamal is 84/kg. When Dulal as a new member, joins the group , average weight of the group becomes 80 kg. If another man Einul whose weight is 3 kg more than that Dual, replaces Alam, then the average weight of the group becomes 79 kg What is the weight of Alam.

The perimeter of a square field is equal to the perimeter of a rectangular field. Length of the rectangular is 3 times of its width and the area is 768 square meter. How many square sized tiles of 80 centimeter width will be required to cover the square field?

A, B and C started a business jointly with a total amount of Tk. 28,000. A paid Tk. 4,500 more then B and B paid Tk. 7,000 less than C. If the company made a profit of Tk. 5,600. How much profit should C receive?

Solve the equation : $\frac{4}{2x+1}+\frac{9}{3x+2}=\frac{25}{5x+4}$

A boat running upstream takes 8 hours 48 minutes to cover a certain distance, while it takes 4 hours to cover the same distance running downstream. What is the ratio between the speed of the boat and the speed of the water current respectively?

3 coins are tossed at random, show the sample space and find the the probability of getting: 

i. One head two tails 

ii. One tail 

iii. One tail and two heads

A, B and C can complete an work in 12, 15 and 25 days resctively. A and B started working together where area C worked with them in every third day. find the number of days required to complete the work.

The price of a shirt and a pant together is Tk. 1, 300 . If the price of the shirt increases by 5% and that of the pant by 10% , it costs Tk. 1,405 to buy those two things. Find the respective price of a shirt and a pant.

Twice the width of a rectangle is 10 meters more the its length. If the area of the region enclosed by the rectangle is 600 square meters , then find its perimeter.