১০টি বইয়ের মধ্যে ৪টি বই কত প্রকারে বাছাই করা যায়, যাতে নির্দিষ্ট দুইটি বই সর্বদা বাদ থাকে?

A seasoned workers efficiency is twice as much as an apprentice's. If they work together for 10 days on a project and earn Tk.45000 together, what is the daily wage of the apprentice?

Zaid's mother contributes to her son's savings by giving him 10% of his total savings. If Zaid saves Tk.200 in June, Tk. 250 in July and Tk.150 in August. How much will he have in savings at the end of August?

If $\sqrt{9+\sqrt{y}}=\sqrt{y+3},$ then y could be equal to which of the following?

The cost of 18 articles is the same as the selling price of n articles. If the profit is 20%. Then what is the value of n?

Netflix's subscriber drops by one-fifth in every 4 years. If Netflix currently has 100,000 subcribers, how many subscribers will it have in 12 years from now?

Printer P, Printer Q and Printer R can print a batch of flyers in 4,8 and 16 hours respectively. How many Printer R are needed with One Printer P and three Printer Q to
complete the lot in 1 hour?