A box contains 200 pens of which 25% are red and the rest are black. You sold a certain number of pens, of which 60% were black. You found that among the remaining pens, only 20% are red. How many pens did you sell?
Kajol riding his bike at 24 km/h reaches his office 5 minutes late. If he would have reached the office 4 minutes earlier than the scheduled time by traveling 25% faster, how far is his office from his house in km?
M, N and P were each paid the same hourly rate rate to rate to paint a building.M worked for a full day, N worked for half a day and P worked half as long as N worked. Together they earned BDT 560. How much money did N receive?
If the length an edge in a cube is 33, what is the length of the longest diagonal?
সম্পূর্ণ খালি একটি চৌবাচ্চ একটি পাইপ দিয়ে ৫ ঘন্টায় সম্পূর্ণ ভর্তি করা যায়। দ্বিতীয় একটি পাইপ দিয়ে চৌবাচ্চাটি ভর্তি করতে ৩ ঘণ্টা লাগে। দুটি পাইপ একসাথে ব্যবহার করে চৌবাচ্চাটি ২/৩ অংশ ভর্তি করতে কত সময় লাগবে?
৮১৫ ঘণ্টা
৩৪ ঘণ্টা
৫৪ ঘণ্টা
২৩ ঘণ্টা