A student makes twice as many mistake as he makes correct answer in an exam. For each wrong answer is deducted from his score. If he scores 20 in the exam, how many questions did he attempt in the exam? (একজন শিক্ষার্থী পরীক্ষায় সঠিক উত্তরের চেয়ে দ্বিগুণ ভুল করে। তার স্কোর থেকে প্রতিটি ভুল উত্তরের জন্য  কাটা হয়। যদি সে পরীক্ষায় ২০ নম্বর পায়, তাহলে সে পরীক্ষায় কতটি প্রশ্নের উত্তর করেছিল?)

A man takes 5 hr. 15 minute to walk a distance and return back by riding a bicycle. It takes 8 hours to walk b...

A sales person sold an item at 15% profit. Had the purchased the item for 25% less and sold for Tk. 6000 less....

Three types of rice costing TK. 100/kg TK. 110/kg and Tk. 130/kg are mixed together and the mixture is sold tk...

Ahmed sold a t-shirt for Tk. 810, and gain 8%. How much did he purchase it for?/ আহমেদ একটি টি-শার্ট ৮১০ টাকায়...

If a + b = 4 and ab = -12, then a - b equals to-

You are looking at a billboard 40 m away with an angle of elevation of 30°. At what height is the billboard?/...