3 years ago

Question:

Mathematics

1 answer:

-Dominant- [34]3 years ago

6 0

C I took the tests on eg today

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A 110 point exam is made up of 50 questions. some questions are worth 2 points others are worth 4 points how many of each type o

Norma-Jean [14]

X - the number of the questions worth 2 points
y - the number of the questions worth 4 points

$x+y=50 \\
2x+4y=110 \\ \\ 
\hbox{from the 1st equation:} \\
y=50-x \\ \\
\hbox{substitute 50-x for y in the 2nd equation:} \\
2x+4(50-x)=110 \\
2x+200-4x=110 \\
-2x=-90 \\
x=45 \\ \\
y=50-45=5$

The answer:
There are 45 questions worth 2 points and 5 questions worth 4 points.

7 0

2 years ago

<img src="https://tex.z-dn.net/?f=5%20%5Ctimes%205" id="TexFormula1" title="5 \times 5" alt="5 \times 5" align="absmiddle" class

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