Add 5/7 + 2/5 + 1/15.
Thank you for the opportunity to help.
To solve this problem, adding fractions, you must find a common denominator. The easiest way is to multiply the three denominators together. This certainly ensures that each denominator is a divisor of teh common denominator.
Let's try: 7*5*15 = 525
So multiplying each numerator to convert the fraction to ...