in a group of 28 junior high school students , 7 take french , 9 take spanish , and 4 take both languages . the students taking both french and spanish are not counted with the 7 taking french or the 10 taking spanish . how many students are not taking either french or spanish ?
"e 8 add 7 + 9 + 4 to get 20 . then subtract 21 from the total students ⇒ 28 – 20 = 8 . answer is e"
subtract(28, add(7, 9))