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25 persons can complete a work in 60 day...

25 persons can complete a work in 60 days. They started the work. 10 people left the work after x days. If the whole work was completed in 80 days, then what is the value of x ?
25 व्यक्ति किसी कार्य को 60 दिनों में पूरा कर सकते हैं | उन्होंने कार्य शुरू किया | x दिनों के बाद 10 लोगों ने कार्य छोड़ दिया | यदि पूरा कार्य 80 दिनों में पूरा हुआ, तो x का मान ज्ञात करें |

A

a)9

B

b)8

C

c)12

D

d)15

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