Math NM simple equation question

2007-02-28 1:09 am

There are a total of 16 $1 and$2 coins and they make up $30.H ow many $2 coins are there?(Pleaes give me the Roll Form and Last Sentence!)

回答 (2)

2007-02-28 1:12 am

✔ 最佳答案

Let there be (x) $2 coins, ( 16-x ) $1 coins

2x + 1( 16-x ) = 30
2x + 16 - x = 30
x = 14 //

There are 14 $2 coins.

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2007-02-28 1:27 am

Let x be the numbers of $2 coin
Let 16-x be the numbers of $1 coin

(16-x)+2x=30
x=14

so, the number of $2 coins is 14..

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