Present age of bob is equal to abbay age 8year ago four year hence bob age respectively ratio to abay age is 4:5what is present age of bob

"Present age of bob is equal to abbay age 8year"

---> Abby is 8 years older than Bob

let Bob's present age be x
Abby's present age is x+8

"four year hence Bob age respectively ratio to Abby's age is 4:5"
----> (x+4)/(x+12) = 4/5

cross-multiply and solve for x

Next time, make sure your post contains proper sentence structure and punctuation. It helps not having to figure out what you mean.

To find the present age of Bob, we need to set up equations and solve them.

Let's represent the present age of Bob as B and the present age of Abbey as A.

Given that the ratio of Bob's age to Abbey's age, four years hence, is 4:5, we can write the equation:

(B + 4) / (A + 4) = 4/5

Next, we are given that the present age of Bob is equal to Abbey's age 8 years ago. So, we can write another equation:

B = A - 8

Now, we have a system of equations to solve:

(B + 4) / (A + 4) = 4/5 ...(1)
B = A - 8 ...(2)

We can start by solving equation (2) for B:

B = A - 8

Now substitute this value of B in equation (1):

(A - 8 + 4) / (A + 4) = 4/5
(A - 4) / (A + 4) = 4/5

Cross-multiply:

5(A - 4) = 4(A + 4)

5A - 20 = 4A + 16

Combine like terms:

A = 36

Now that we have the value of A, we can substitute it back into equation (2) to find the value of B:

B = A - 8
B = 36 - 8
B = 28

Therefore, the present age of Bob is 28.