Question

a+b=8
c×d=9
a×c=21
b-d=5
Find abcd values

Answer 1

Answer:

a+b=8-----------------1

c×d=9 -----------------2

a×c=21 ----------------3

b-d=5------------------4

equation 1 -2 we get ,

a+d=3-------------5

from 2 we have d=9/c

substituting in 5

a+ 9/c=3

ie.   ac+9 =3c------------------6

from 3 we have ac=21

substituting in 6

21+9=3c

3c=30

c=10

substituting in 3

a x 10=21

a=2.1

substituting in 2

10 x d=9

d=9/10=0.9

from 1 we have,

2.1 + b=8

b=5.9

therefore ,

a=2.1

b=5.9

c=10

d=0.9

hope it helps .....