Question 188941
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First Condition of Sales for Monday:
<font color=blue>CB=3HB</font> , more cheeseburgers were sold, 3 times that of hamburgers sold.


Second condition:
<font color=blue>CB + HB = 448 </font>


Substitute 1st condition into 2nd condition:
{{{highlight(3HB)+HB=448}}}
{{{4HB=448}}} ----> {{{cross(4)HB/cross(4)=cross(448)112/cross(4)}}}
{{{highlight(HB=112pcs)}}}, number of hamburger sold


Go back 1st condition:
{{{CB=3*112=highlight(336pcs)}}}, number of cheeseburger sold


Thank you,
Jojo</font>