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Satyam and Shivam can do a piece of work...

Satyam and Shivam can do a piece of work in 10 days and 15 days respectively. They both started together. After 4 days Satyam quits working. The remaining work is to be completed by Shivam. In how many days the entire work will be completed?
सत्यम और शिवम किसी कार्य को क्रमशः 10 दिनों और 15 दिनों में कर सकते हैं | दोनों साथ मिलकर शुरू करते हैं | 4 दिन बाद सत्यम कार्य करना छोड़ देता है | शेष कार्य शिवम को पूरा करना है | पूरा कार्य कितने दिनों में समाप्त हो जाएगा?

A

9

B

12

C

10

D

6

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