An exam worth 145 points contains 50 questions. Some of the questions are worth two points and some are worth five points. How m
any two point questions are on the test? How many five point questions are on the test?
1 answer:
A*5+b*2=145
a +b =50 | * -2
5a +2b=145
-2a -2b = -100
----------------------
5a-2a = 145-100
3a= 45
a=45:3
a=15 questions are worth 5 p
b=50-15=35 questions worth 2 p
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