For the following questions answer them individually
If 'A' means '$$+$$', 'B' means '$$-$$', 'C' means '$$\times$$' and 'D' means '$$\div$$', then 81 D 9 C 5 D 15 A 8 B 11 = ?
If $$\frac{\cos \theta}{1 - \sin \theta} + \frac{\cos \theta}{1 + \sin \theta} = 4$$, find the value of $$\theta$$, where $$\theta$$ is acute.
Find the maximum number of children among whom 429 pencils and 715 pens can be equally distributed.
If in a certain language, 'oka peru' means 'fine cloth', 'meta lisa' means 'clear water' and 'dona lisa peru' means 'fine clear weather', what word in that language mean 'weather'?
A work is completed by P and Q working together 8 hours perday. Working 8 hours a day P alone will take 12 days to complete work, while working alone Q will take 10 days working 12 hoursa day,to complete it. In how manydays did they complete the work together?
A man takes twice as long to go upstream as to row downstream. What is the ratio of speed of boat in still water and the speed of stream?
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