The average age of a husband, his wife and daughter three years ago was 27years and that of the wife and daughter five years ago was 20years. husband's present age is

let's say:

Husband's present age: a

Wife's present age : b

Daughter's present age : c

(a - 3) + (b - 3) + (c - 3) = 27 x 3

a + b + c = 90

(b - 5) + (c - 5) = 40

b + c -10 = 40

b + c = 50

a = 90 - 50

a = 40

Husband's present age is 40 years old.

b

step-by-step explanation:

the total is 23.97. 0.25% is off so you have to subtracting 25% from 100% and you will get 75% if you convert it to decimal you will get 0.75. you have to find the original because the formula is % times original = total.so you have the total and the % so you just have to plug it in.

the direct variation says that:

then the equation is of the form is given by:

            where k is the constant variation.

from the given table:

consider any value of x and m(x)=y

x = 2 and m(x)=y = 3

substitute these value in [1]; we have;

divide both sides by 2 we get;

⇒

check:

put x = -1 and m(x) = -1.5

substitute in the equation:

-1.5 = -1.5                   true

therefore, the function m(x) represents a direct variation

graph of this function as shown below: