book Maths Puzzle Numerical Ability

-2(x-4)=15

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gasoline prices are also afton a topic in the news. gas prices in germany are 1.55 euro to liter. convert this to $ over gallon. The treasurer of Wilbanks and Co. has some $10 bills and $20 bills. How many of each type does she have if there are n altogether and they have a value of v?