Question 1210594
Luka and his friends were preparing for a local bazaar.
We do not know what his friends did to prepare for the bazaar.
We know that Luka make friendship bracelets and cookies.
We all agree that Luka spent 3 hours and 20 minutes baking cookies.

We also know that the ratio of the number of cookies Luka baked to the number of bracelets he made was 5:2.
That means that for every 5 cookies he made, he made 2 bracelets.
That means that the number of bracelets he made is {{{highlight(2/5)}}} of the number of cookies he made.
We assume that Luka took all the cookies and bracelets he made to the bazaar to be sold.
 
2. If Luka sold 3/5 of his cookies, and he had 48 cookies left, what do we know?
 
In that case, and if no one got any cookies for free, the fraction of the cookies Lukas made that he did not sold must be the fraction of cookies Luka had left.
That fraction is {{{1-3/5 = 5/5-3/5 = highlight(2/5)}}} of the cookies he made. and that amounts to {{{48}}} .
But we know that the number of bracelets Luka made is {{{2/5}}} of number of cookies he made.
That means that Luka made {{{48}}} bracelets.
If Luka "sold 1/2 of his bracelets" at the bazaar, then he had the other 1/2 of his bracelets remaining, and that is 1/2 of 24, or 
{{{(1/2)*24=highlight(12)}}} bracelets remaining.