Mrs. Tart takes a survey in class. She discovers 60% of her students prefer using pens over pencils in class. If 12 students in Mrs. Tart’s class prefer to use pens, how many total students are in Mrs. Tart’s class?

20 students

Step-by-step explanation:

If,

60% = 12 students

∴ 1% = 12\60 students

∴ 100% = (12*100)\60 students

            = 20 students

{ easiest way for me}

the answer would be 1 1/72

step-by-step explanation:

you can rewrite the equation by separating the parts and then solving individually:

10-9=1

1/8 - 1/9=

find l c d and then combine:

1 1/72