You can calculate the number halfway between 250 and 330 by adding them together, then divide by 2. For example, 250 + 330 = 580, and 580 divided by 2 = 290, which is the number halfway between the two numbers.
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The difference between 250 and 330 is 80. In terms of time, which you may have meant, 2:50am to 3:30am is 40 minutes. 2:50am to 3:30pm is 12 hours and 40 minutes. 2:50pm to 3:30pm is 40 minutes. 2:50pm to 3:30am is 12 hours and 40 minutes.
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To find 150 percent of a number, multiply the number by 1.5. In this instance, 1.5 x 220 = 330. Therefore, 150 percent of 220 is equal to 330. Or another way of solving these types of percentages, called whole plus percentages, is simple. 100% of any number is the number itself (100% of 220 is 220) and 50% of any number is exactly half of the said number (50% of 220 is 110) and then add the two together (220 + 110 is 330).