Question

a+b+c+d=30
a+b+c=22
b+d+d+d=29
a+a+a=27

What is the value of c

Answer 1

Hey !!!

a + b + c + d = 30 ---- 1 )
a + b + c = 22 ----------2)
b + d + d + d + d = 29
a + a + a = 27

substracting equestion 2 from 1 equation
we get ,

a + b + c + d = 30
a + b + c = 22
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d = 8

now , substitute the value of d on 3 equation

b + d + d + d = 29
b + 3d = 29
b + 3×8 = 29
b = 29 - 24
b = 5

Lets us see 4th equation

a + a + a = 27

3a = 27

a = 9

we got , a = 9 , b = 5 and d = 8

Now substitute the value of a , b , c on equation 1 )

a + b + c + d = 30

9 + 5 + c + 8 = 30

c = 30 - 21

c = 9 Answer ✔

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Hope it helps you !!!

@Rajukumar111