the average attendance of a class from Monday to Wednesday was 39 and that from Wednesday to saturday was 39.5 . what was the attendance on Wednesday, if the average attendance from Monday to Saturday was 40 ?

Answer 1

M+T+W = 3(39) =117
W+TH+F+SA = 4(39.5) = 158
Add them
M + T + 2W + TH + F + SA = 275
Finally:
M+T+W+TH+F+SA = 240

Let's subtract those last two equations:
ahhh,
W = 35

Answer 2

Yes like this only

Answer 3

from where did the 240 come

from nowhere

Answer 4

How do you get 117?
I no understand

please explain to me

Answer 5

Reiny knows what she is talking about. As for the rest, give me a break.

Answer 6

Reiny again:
M+T+W = 3(39) =117

W+TH+F+SA = 4(39.5) = 158
Add them
M + T + 2W + TH + F + SA = 275
Finally:
M+T+W+TH+F+SA = 240

Let's subtract those last two equations:
ahhh,
W = 35

Reiny
answered by Reiny
calendar icon 7 years ago

Answer 7

M+T+W = 3(39) =117

W+TH+F+SA = 4(39.5) = 158
Add them
M + T + 2W + TH + F + SA = 275
Finally:
M+T+W+TH+F+SA = 240

mon + tues + wed + thurs + fri + sat = 6*40 = 240
which is where Reiny got 240

Answer 8

mon + tues + wed + thurs + fri + sat = 6*40 = 240
which is where Reiny got 240