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Alona [7]
3 years ago
7

David has a checking account. His opening balance on 3/1 was $120. The bank charges a 30¢ fee for each debit card transaction an

d a 20¢ fee for each check. David made the following transactions:
Used debit card for $20 movie tickets on 3/5
Deposited $38 paycheck on 3/12
Transferred $25 to savings account on 3/16
Withdrew $20 cash from ATM on 3/20



What is David’s balance after the transaction on 3/20?
Mathematics
2 answers:
sukhopar [10]3 years ago
7 0
0! David's balance is $0 after the transaction.
Luden [163]3 years ago
6 0
David has zero balance in his account.
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Step-by-step explanation:

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Ms. Nina has 10 lbs of 25% sugar syrup. How much water does she need to add to make 10% sugar syrup?
ryzh [129]
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let's say she adds "x" lbs of water, to get "y" lbs for the 10% mixture.

how much is 25% of 10lbs?  well, (25/100) * 10, or 2.5.

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\bf \begin{array}{lccclll}
&\stackrel{lbs}{syrup}&\stackrel{concentration~\%}{syrup}&\stackrel{concentration}{amount}\\
&------&------&------\\
\textit{25\% syrup}&10&0.25&2.5\\
\textit{pur water}&x&0.00&0.00x\\
------&------&------&------\\
\textit{10\% mixture}&y&0.10&0.10y
\end{array}
\\\\\\
\begin{cases}
10+x=\boxed{y}\\
2.5+0.00x=0.10y\\
----------\\
2.5 = 0.10\left( \boxed{10+x} \right)
\end{cases}
\\\\\\
2.5=1 + 0.10x\implies 1.5=0.10x
\\\\\\
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