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oee [108]
2 years ago
12

At a math contest 20problems we’re given each correct answer earned 5 points and 2 points were deducted for each incorrect answe

r Lenore answer all the problem receiving a score of 72 how many correct answer did she have
Mathematics
1 answer:
IRINA_888 [86]2 years ago
6 0

Answer:

she has 16 correct answer

Step-by-step explanation:

Mathematically ,we can translate this word problem into this system of equations :

\begin{cases}5x-2y=72&\left( 1\right)  \\ x+y=20&\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}5x-2y=72&\left( 1\right)  \\ 2x+2y=40&2\times\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}7x=72+40=112&\left( 1\right)+2\times(2)  \\ x+y=20&\left( 2\right)\end{cases}

\Longleftrightarrow \begin{cases}x=\frac{112}{7}=16   \\ y=20-x=20-16=4&\left( 2\right)\end{cases}

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