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When a two-digit number is multiplied by...

When a two-digit number is multiplied by the sum of its digits, the product is 424. When the number obtained by interchanging its digits 15 multiplied by the sum of the digits, the result is 280. The sum of the digits of the given number is :
दो अंकों की एक संख्या को जब इसके अंकों के योग से गुना किया जाता है, तो गुणनफल 424 आता है | जब इसके अंकों को पलटने से बनी संख्या को अंकों के जोड़ से गुना किया जाता है, तो परिणाम 280 आता है | दी गयी संख्या के अंकों का योग है -

A

7

B

6

C

8

D

9

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