Values of 2

^{nd} number = 7 and 6 (They are not the same)

**Make the values of 2**^{nd} number same as follows -

Multiply 3:7 up and down with 6 as shown

Multiply 6:5 up and down with 7 as shown

**Values of 2**^{nd} number are now same = 421

^{st} number : 2

^{nd} number = 18 : 42

2

^{nd} number : 3

^{rd} number = 42 : 35

1

^{st} number : 2

^{nd} number : 3rd number = 18 : 42 : 35

**Common factor helps in finding actual values easily**So, take ‘A’ as common factor.

So now the 3 numbers are 18A, 42A and 35A

18A + 42A + 35A = 285

A = 3

3

^{rd} number = 35A = 35 x 3 = 105