sirenia

a veterinarian survey 26 of his patrons.e discovers that 14 have dogs ,10have cats ,and 5 have fish .our have dogs and cats ,3 have have dogs and fish ,and one has a cat and fish .if no one has all three kinds of pets ,how many patrons have none of these...

4/9 +1/3 7/8 + 1/16 9/10 + 1/15 11/12-7/12 4/5 -2/5 3/8-2/8 7/8-1/16 5/8-1/3 5/7-1/3

i think japanese i am taking that class at school and it pretty fun to learn or chinese

ok but how do you find the common denominator?