A student recieved scores of 62, 75, and 77 on three quizzes. If tests count twice as much as quizzes, what is the lowest score that the student can get on the next test to achieve a mean of at least 70?
+118723 A test is like 2 quizzes Test = Q+Q =2Q
so
$$\begin{array}{rll}
\frac{62+75+77+2Q}{5} &\ge& 70\\\\
\frac{214+2Q}{5} &\ge& 70\\\\
214+2Q &\ge& 350\\\\
214-214+2Q &\ge& 350-214\\\\
2Q &\ge& 136\\\\
Q &\ge& 68\\\\
\end{array}$$
The student needs to get at least 68 in the next test 
+118723 A test is like 2 quizzes Test = Q+Q =2Q
so
$$\begin{array}{rll}
\frac{62+75+77+2Q}{5} &\ge& 70\\\\
\frac{214+2Q}{5} &\ge& 70\\\\
214+2Q &\ge& 350\\\\
214-214+2Q &\ge& 350-214\\\\
2Q &\ge& 136\\\\
Q &\ge& 68\\\\
\end{array}$$
The student needs to get at least 68 in the next test
