Question 145873
Let "x" = total study time
So,
{{{(1/3)x}}} = Math homework
{{{(2/7)x}}}= Preparing history exam
Adding the two we'll get the time allocated for these right?
={{{(1/3)x + (2/7)x}}}
={{{(7x+6x)/21}}}
= {{{ highlight((13/21)x)}}} -------- time allocated for Math & history
So total study time remaining,
={{{x- (13/21)x}}}
={{{x(1-13/21)}}}
={{{highlight((8/21)x)}}} ----------- time remainig to study
So if he has total 60 minutes allocated(just an example) for the whole study,
= {{{(8/21)(60)}}}
= 22.86 minutes remains
<pre><font size=4=indigo>Thank you,
Jojo</pre>