Question

_7 वर्ष पूर्व A तथा B की आयु का अनुपात क्रमश: 4:5
___ था तथा 7 वर्ष बाद इनकी आयु का अनुपात क्रमशः
5:6 होगा. B की वर्तमान आयु कितनी है?
(a) 56 वर्ष
(b) 63 वर्ष
(c)70 वर्ष
(d) 77 वर्ष​

Answer 1

⭐Solution⭐

✔ let age of A = X

Age of B = y

a/c to questions .

(x-7):(y-7)= 4:5

=>(x-7)/(y-7)= 4/5

=>5x-35= 4y-28

=> 5x-4y = 7......(1)

Again,

(x+7):(y+7)=5:6

=>(x+7)/(y+7)=5/6

= > 6x+42= 5y+35

=>6x-5y = - 7...... (2)

multiply by 6 and 5 in (1) and (2)

30x -24y = 42..(3)

30x -25y = -35....(4)

subtract its

y = 77

by (1),

5x -4×77=7

=>5x = 7+308

=>x = 315/5

=>x = 63.

⏩Thus:-

Present age of B = 77years.

✔Hopes its help's u.

⭐Marks Brainliest .

Answer 2

Answer:

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