book Maths Puzzle Numerical Ability

This is the death of me.. linear word problem!.. Pleas be kind to me in explaining the steps taken to solve this!!

Charles Lindbergh estimated that at the beginning of his fligh

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Anna went to the grocery store. she bough 3 oranges and 6 apples. she paid $4.50. Maria went to the same store and bough 2 oranges and 2 apples. Her cost was $2.10. How much would 1 apple cost?
thanx The sum of the angle measures of any triangle is 180 degrees. Find the angle measures of a triangle if the second angle measures 10 degrees less than twice the first, and the third angle measures 25 degrees more than the second.