book Maths Puzzle Numerical Ability

Mitch invested $7500 for 1 year, part at 12% annual intrest and the rest at 10% annual intreast. His total intrest for one year was 890. How much money did he invest at 12%.

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The combined ages of Mary and Ann are 44 years. Mary is twice as old as Ann. When Mary was half as old as Ann will be when Ann is three times as old as Mary, when Mary was three ti the sum of the digits o a two digit number is 12. if the digits are reversed, the new number is 16 less than the original number. find the original number.