Question

the average of a,b,c is 5 more than average of b,c,d .Twice of a is 7 less than thrice of d find values of a and d​

Answer 1

Answer:

a=22,& d=17 accodng to my knowledge.

Step-by-step explanation:

just have a look over it if it is ok then tell me in comments

Answer 2

Answer:

a=52 and d=37.

Step-by-step explanation:

We have, a, b, c are three numbers and their average is (a+b+c)/3.

Again, b, c, d are three numbers and their average is (b+c+d)/3.

Given that, (a+b+c)/3=5+ (b+c+d)/3

⇒a/3=5+d/3

⇒a=15+d

⇒ a-d=15 ....... (1)

⇒ 2a-2d =30 ......... (2)

Again, by the given condition, 2a=3d-7, ⇒ 2a-3d =-7 ...... (3)

Now, (2) -(3), we get, d=37

So, from equation (1), a=15+d =15+37 =52

Hence, the value of a is 52 and that of d is 37. (Answer)