Question

given m:n=4:3 and m+n+21,find the value of m-n

Answer 1

Step-by-step explanation:

let m be 4k

and n be 3k

4k+ 3k = 21

7k = 21

k = 21/3 = 3

k= 3

4k= 12

3k= 9

m-n = 12-9 =3

so, m-n =3