4/5 of 15 is 12.
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To add one fifteenth (1/15) and one fifth (1/5), first convert one fifth to have a common denominator of 15. One fifth is equivalent to three fifteenths (3/15). Therefore, 1/15 + 3/15 equals 4/15.
It is: 2/3 plus 4/5 = 22/15
4/5 x 1/3 = 4/15
It is: 1/5 of 15 = 3
2/5 divided by 4/15 is identical to 2/5 x 15/4 ie 30/20 or 1.5 (1½)