Solve the equation by finding the common multiple. Three fourths minus two sixths plus seven twenty fourths equals blank.
A) seventeen twenty fourths
B) eighteen twenty fourths
C) nineteen twenty fourths
D) twenty twenty fourths

Its A

You first make 3/4 and 2/6 have a common denominator of 7/24 so you multiply the denominator by however much you need to get it to 24 after that you multiply the numerators by 3x6 and 2x4

then you have

18/24 - 8/24 + 7/24 which = 17/24