book Maths Puzzle Numerical Ability

My grandfather was x years old in the year x squared. In what year was he born?

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Can someone help solve this problem for me?

What is 48.3% of 1,500?
Can you show me how you get your answer?
Thanks,
Sher
The fixed costs for making chicken feed are $100.00. The marginal cost o make each bag of feed is $20. Management decides to charge $30 per bag of feed.

(A) write the cost fu