The ratio between the ages of a and b is 7:9 9years ago,their ages were in ratio pf 2:3.find the present age.
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let x prepare in the ratio the 7x by 9x.
7x -9 by 9x -9 = 2 by 3
3( 7x-9)= 2(9x -9)
21x -27 = 18x -18
21x - 18x = 27 -18
3x = 9
x =3.
present age of a
7x = 7×3 = 21 year .
present age of b
9x= 9 × 3 = 27 year.
7x -9 by 9x -9 = 2 by 3
3( 7x-9)= 2(9x -9)
21x -27 = 18x -18
21x - 18x = 27 -18
3x = 9
x =3.
present age of a
7x = 7×3 = 21 year .
present age of b
9x= 9 × 3 = 27 year.
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