question number 28 solve

Let the temperature on Monday = x = temperature on Tuesday

(x+x+40+40+40+40+40)/7 = 37.4
(2x+200)/7 = 37.4
(2x+200) = 37.4*7
2x+200 = 261.8
2x = 261.8 - 200
2x = 61.8
x = 30.9

So, the temperature on Monday and Tuesday was 30.9?C