For a school play, the teacher asked the class to set up chairs in 20 rows with 25 chairs in each row. after setting up all the chairs, they were 5 chairs short. how many chairs did the class set up? show your work.

495 chairs were set up.

Step-by-step explanation:

If a teacher asked the class to arrange C chairs in R rows then total number of chairs will be = C × R

If there are are 5 chairs short in the class set then number of chairs used

= (C × R) - 5

Now it has been given that number of chairs and number of rows are 25 and 20 then the chairs used will be

= (25 × 20) - 5

= 500 - 5

= 495

Therefore, 495 chairs were used in the class set up.

step-by-step explanation:

abc

step-by-step explanation: given equation a = h(b 1+b 2)

also we are given values of a, h and b 1 as :

a = 16, h = 4, and b 1 = 3.

in order to solve it for b 2, we need to plug the given values of   a, h and b 1 .

therefore, plugging values of   a, h and b 1   in given equation, we get

16 = 4( 3 + b 2)

first dividing both sides by 4, we get

4 = 3 + b 2

subtracting 3 from both sides, we get

4 -3 = 3 -3 + b 2

1 = b 2.