Question

in a school of 200 students,120 took math,90 took physics ,70 took chemistry,40 took both math and physics ,30 took both physics and chemistry, 50 took math and chemistry and 20 took none of these subject .how many student took all 3 subject ?​

Answer 1

Step-by-step explanation:

120+90+70+40+30+50=400

400 -200 = 200

200 / 3 =aproxiatmely 67