The mean of five numbers is 18. If one number is excluded, their mean is 16. The excluded number is:

Correct Answer: A.

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There were 600 students in a school. Each offered either English or Hindi or both. If 75% offered English and 45% Hindi, how many offered both?

If an alloy contains copper and silver in the ratio 3:7, then the percentage quantity of silver in the alloy is: