book Maths Puzzle Numerical Ability

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?
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Thirty students bought pennants for the football game.Plain pennants cost $4 each and fancy ones cost $8 each.if the total bill was 168 how many students bought the fancy pennants This is the death of me.. linear word problem!.. Pleas be kind to me in explaining the steps taken to solve this!!

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