500,000 ÷ (8+12)
500,000 ÷ 20
= 25,000
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You start of with a whole pie and if you cut in two equal pieces you have two half pies. If you cut the two half pie pieces in half you end up with 4 equal pieces of the original pie and these are called quarters. So to get a half you divide by 2 To get a quarter you divide by 4 Thus 12/4 = 3 or 4*3=12 Thus a quarter of 12 is 3.
The sum of digits: 4 + 3 + 5 = 12 12 can be divided equally by 3, so 435 can be divided equally as well.
0.5833
If, by two straight lines, you mean two diameters, the answer is No, you cannot. Two diameters will divide the clock face into four parts. The sum of the numbers, 1 to 12, is 78 which is not divisible by 4. A diameter from between 9 and 10 (to between 3 and 4) will divide the clock face into halves, and the numbers in each half add to 39. Unfortunately, that is only one line, and not two as required.
To calculate half (1/2) of any number, divide that number by 2.