If 1/2 of the air in a tank is removed with each stroke of a vacuum pump,what fraction of the original amount of air has been removed after 4 strokes?
A positive number x is multiplied by 2. and this product is then divided by 3. If the positive square root of the result of these two operations equals x, what is the value of x?
Masud's income is 60 percent more than Robi's income, and Robi's income is 40 percent less than Moni's income. What percent of Moni's income is Masud's income?
what is the area of an equilateral triangle with a side of 1 inch?
Mr. Alfred buys two lots mangoes. the first lot costs him TK.300 per dozen and the second TK. 500 per dozen. He sold all the mangoes at TK. 400 per dozen. Find his profit/loss percentage if he spent the same amount of money on each of the lots.
The ratio of the sum of the reciprocals of x and y to the product of the reciprocals of x and y is 1:3. What is sum of the numbers x and y?
The minimum temperatures from Monday through Sunday in the first week of December in a region are observed to be 20c,40c,40c,50c,70c90c,100c. What is the range of the temperatures?
Two whole numbers whose sum is 64, cannot be in the ratio
A train of length l, traveling at a constant velocity, passes a pole in t seconds .If the same train traveling at the same velocity passes a platform in 3t seconds, then the length of the platform is-------
If 75 percent of a class answered the first question on a certain test correctly, 55 percent answered the second question on the test correctly, and 20 percent answered neither of the questions correctly, what percent answered both correctly?
If the length of a rectangle is increased by 120% and its width is decreased by 20% , What happens to the area of the rectangle?