AFCAT Model Paper 2

Given:
Ratio of two numbers = 7 ∶ 4
Concept used:
Converting percentage into ratio
50%=

1

2

,20%=

1

5

,25%=

1

4

,60%=

3

5

Calculations:
Let, First number be 70x and The second number be 40x
First number after increase =70x+(

1

2

)×70x
⇒ 105x
First number after decrease =105x–(

1

5

)×105x
⇒ 84x
Second number after first increase =40x+(

1

4

)×40x
⇒ 50x
Second number after second increase =50x+(

3

5

)×50x
⇒ 80x
First to second number ratio after the change =

84x

80x

∴ New ratio of the two numbers is 21 ∶ 20