the answer is 20.
the formula is 1/2 * 8 * 5
then this will be 8 * 5 /2
= 40/2
20.
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1/2 x 3/4 = 3/8
1/4 * 2+1/2 = 1/4*5/2 = 5/8
1/2 x 1/4 = 1/8
4/5 of 5/8 = 4/5 x 5/8 = 4/8 x 5/5 = 1/2 x 1 = 1/2
if you mean 8 times a half, then you work it out like this: 2 times a half is: 1 4 times a half is: 2 8 times a half is: 3