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There are 60 seconds in a minute, so a half minute would be 30 seconds. If you have a length of time in half minutes, multiply that by 30 to get seconds. For example, 20 half minutes = 20 x 30 seconds = 600 seconds
$20 x 1.5 = 30 dollars
20 x 1.5= 30
One half of 30 is 15.One half of 30 is 15.One half of 30 is 15.One half of 30 is 15.One half of 30 is 15.One half of 30 is 15.
If half of the number is 20, then the number must be 2 * 20 = 40. Therefore three quarters of the number would be 3 * (40/4) = 30.