Sara is taking a test made up of multiple-choice and open-ended questions. The multiple-choice questions have a value of 4 point
s each, and the open-ended questions have a value of 5 points each. If Sara has already answered 10 multiple-choice questions correctly, which inequality best describes the amount of open-ended questions Sara must answer correctly to earn more than 70 points? x>6
x<6
x>12
x<12
To find this, you must find the total number of point Sara has scored already. She has answer 10 multiple choice questions which are 4 points each. This means that Sara has scored 40 points so far.
If Sara wants to score at least 70 points, she needs to score at least 30 more points. To find how many open ended questions she needs to answer, you need to divide the remaining number of points by the number of points an open ended question is worth. The number we get will be x.
30/5 = 6
This means Sara must complete at least 6 open ended questions to score 70. Now all we have to do is figure out which inequality sign to use. Since Sara wants to score more than 70 points, it should be the "greater than" sign.
The number is = 10x+y if reverse the digits, the number is: 10y+x The sum fo its digits is = x+y=5 I suggest this system of equations: (10y+x)-(10x+y)=27 ⇒9y-9x=27 x+y=5 We can solve this system of equations by equaliztion method x=5-y
