Question

When 321 is added to 5a3, then we get a number 8b4 and it is completely divisible by 4. find the sum of highest values of a and b. 
1. 10 
2. 12 
3. 14 
4. 16 

Answer 1

Correct Answer - Option 3 : 14 

Given :

When 5a3 is added to 321 it will give us 8b4. 

Calculations :

Highest number in the form 8b4 divisible by 4 = 884 

Now according to the question 

5a3 + 321 = 884 

5a3 = 563 

Comparing both sides we get, 

a = 6 

Sum of a and b = a + b 

⇒ 6 + 8 

⇒ 14 

∴ Option 4 will be the correct choice