ব্যাংক জব নিয়োগ – গণিত পরীক্ষা

Example 16 :
Ratio of present ages of C & D is 4 : 6 . The present age of C is 40 years. Find the age of D after 6 years.
Answer :
Step 1: C : D = 4: 6, According to Question C present age is = 40 years.
Step 2: So the D present age  we get ( 40 / 4 )X 6 = 10 X 6 = 60 years.
Step 3: After 6 years the age D is 60 + 6 = 66 years.

Example 17 :
The ratio of present ages of two students is 1 : 2 and 5 years back , the ratio was 1 : 3 . What will be the ratio of their ages after 5 years ?
Answer :
Step 1 : Let the present ages of the two students be x years and 2x years respectively .
Then , x – 5 / 2x – 5 = 1 / 3
= 3 ( x – 5 ) = ( 2x – 5 ) = x = 10 . So , replace value of x = 10 .
Step 2 : Required ratio =( x + 5 ) : ( 2x + 5 ) = 15 : 25 = 3 : 5 .

Example 18 :
The ratio between the present ages of A and B is 6 : 7 . If B is 4 years old tha A , What will be the ratio of the ages of A and B after 4 years ?
Answer :
Step 1:Let the A’s age and B’s age be 6x and 7x years respectively . Then , 7x – 6x = 4 . S0, x = 4
Step 2 : Required ratio = ( 6x + 4 ) : ( 7x + 4 ) = 28 : 32 = 7 : 8 .

Example 19:
The ratio of mother age to his son’s age is 7 : 3 . The product of their ages is 756 . The ratio of their ages after 6 years wil be ?
Answer :
Step 1 : Let the present ages of the mother and son be 7x and 3x years respectively .
Then , 7x X 3x = 756
21×2 = 756
= x2 = 36
= x = 6 .
Step 2 : Required ratio = (7x + 6 ) : ( 3x + 6 ) = 48 : 24 = 2 : 1 .

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