৩০৭৯১
In a class the ratio of boys and girls was 7 to 3. If there were 210 girls in the class, what was the number of boys in the class?
উত্তর
63
৩০৭৯২
A fair coin is thrown in the air four times. If the coin lands with the head up on the first three tosses, what is the probability that the coin will land with the head up on the fourth toss?
উত্তর
1/2
৩০৭৯৪
২ বছর আগে বাবার বয়স পুত্রের বয়সের ১৪ গুণ। দুই বছর বাদে বাবার বয়স পুত্রের বয়সের চেয়ে ২৬ বছর বেশি হয়, তবে বাবা ও পুত্রের বয়সের অনুপাত কত হবে?
উত্তর
১৫ : ২
৩০৭৯৫
কোন অনুপাতের উভয় পদের সঙ্গে ১ যোগ করলে অনুপাতটি ৩: ৪ এবং উভয় পদ থেকে ১ বিয়োগ করলে অনুপাতটি ২: ৩ হবে?
উত্তর
৫ : ৭
৩০৭৯৭
A car uses 1 liter of petrol to travel 17 miles. After a tune-up, the car travels 17% farther on one liters. How many liters ( best approximation ) of petrol will it take for the car to travel 170 miles after a tune-up?
উত্তর
8.1
৩০৭৯৮
Of the five bill collectors at Apex Collection Agency, Mr. Mamun has the highest rate of unsuccessful collections. Yet Mr. Mamun is the best bill collector on the agency's staff. which one of the following , if true, most helps to resolve the apparent
উত্তর
None of the bill collectors at the agency has been working longer than Mr . Mamun
৩০৭৯৯
In the middle of around pool lies a water-lily. The water-lily doubles in size every day. After exactly 20 days the complete pool will be covered by the lily. After how days will half of the pool be covered by water-lily?
উত্তর
10
৩০৮০০
Unless the new reserves are found soon, the world's supply of coal is being depleted in such a way that with demand continuing to grow at present rates, reserves will be exhausted by the year 2050. Which of the following , if true , will weaken he above a
উত্তর
There has been a slowdown in the rate of increase in world demand for coal over the last 5 years from 10% to 5%