Question 1113041
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<U>1. - Two equations setup and solution</U>


<pre>
 x + y = 60       (1)
2x - y = 39       (2)
---------------------------Add eq(1) and (2) to eliminate y. You will get

3x = 60+39 = 99    ====>  x = {{{99/3}}} = 33.


<U>Answer</U>.  33 correct answers.  The rest  60-33 = 27 answers are incorrect.


<U>Check</U>.   2*33 - 27 = 39.    ! OK !
</pre>


<U>2 - One equation setup and solution</U>


<pre>
2x - (60-x) = 39.


3x = 39 + 60 = 99  ====>  x = {{{99/3}}} = 33 the same answer.
</pre>