Question

how many students are used in colume when 81 students are arranged in a square form
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Answer 1

Answer:

r=15

c=20

Step-by-step explanation:

r= no. of rows

c=no. of columns

X=total students

r×c=X

(r-5)×(c+10)=X

(r+5)×(c-5)=X

solve these simultaneous equations,we get

10r-5c-50=0

-5r+5c-25=0

5r=75,

r=15

c=20

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