Question

53. Ratio of present ages of two persons A and B is 7:4 and
after four years ratio of their age (B : A) become 6:10.
Then find the present age of B?
(a) 20 years
(b) 18 years
(c) 32 years
(d) 26 years
(e) 24 years​

Answer 1

Answer:

(c)32 years

Step-by-step explanation:

age of A=7x

age of B =4x

after 4 years

age of A=7x+4

age of B=4x+4

4x+4/7x+4=6/10

(4x+4)10=(7x+4)6

40x+40=42x+24

40x-42x=24-40

-2x=-16

2x=16

x=16/2=8

age of B =4x=4×8

=32yrs