RRB Group-D Model Paper 20 with answers for online practice

The sum of two numbers is 64 and their ratio is 7 : 9.
Let numbers be 7a and 9a, where ‘a’ is any constant
⇒ 7a + 9a = 64
⇒ 16a = 64
⇒ a = 4
∴ Numbers are
7a = 28
9a = 36
∴ Sum of digits of these numbers = 2 + 8 + 3 + 6 = 19