Question

17. Question 10.
If 15 + 10 = VIII; 8 + 6 = X, 19 + 12 = X, then what is the value of 9 + 4 = ?
Pick ONE option
7
A) XI
B) VII​

Answer 1

Given :

15 + 10 = VIII; 8 + 6 = X, 19 + 12 = X

To find :

what is the value of 9 + 4 =?

Solution:

let's find out the logic behind the given codes

15+10=VIII

$= > {15}^{2} - {10}^{2}$

$= > 225 - 100$

$= > 125$

=> 1 + 2 + 5 = 8

8 in roman numeral is VIII

So, 15+10=VIII

In the same way, we can find out the code for 9+4=?

$= > {9}^{2} - {4}^{2}$

$= > 81 - 16$

$= > 65$

=> 6 + 5 = 11

11 in roman numeral is XI

So, 9 + 4 = XI

Hence, Option (A) - XI is the required answer.

Answer 2

Given :-

• 15 + 10 = VIII
• 8 + 6 = X
• 19 + 12 = X

To find :-

• Value of 9 + 4 = ?

Solution :-

15+10=VIII

= > 15²- 10²

= > 225 - 100

= > 125

=> 1 + 2 + 5 = 8

8 in roman numeral is VIII

So, 15+10=VIII.

9+4=?

= > 9² - 4²

= > 81 - 16

= > 65

=> 6 + 5 = 11

11 in roman numeral is XI

So, 9 + 4 = XI.

Correct Option :- A