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A sum of `25600 is invested on simple interest partly at 7% per annum and the remaining at 9% per annum. The total interest at the end of 3 years is `5832. How much money (in `) was invested at 9% per annum?

What is the approximate composition of silicon dioxide (SiO₂) present in ordinary Portland cement ? साधारण पोर्टलैण्ड सीमेंट में मौजूद सिलिकॉन डाइ-ऑक्साइड (SiO₂) की लगभग मात्रा कितनी होती है ?

Select the most appropriate option that can substitute the underlined words in the following sentence. I consider that every matter must be considered in every point of view.

Three years ago the age of a man was six times the age of his grandson. After three years, his age will be 6 more than four time the ago of his grandson. What is the present age of the grandson ?

‘दशानन’ में कौन सा समास है?