Question 807964
"If there are 245 pennies minted before 1975 in the jar,"


That is half of the 35%.  I see no other formal way to handle the problem, but working with this first fact, 35% of the coins in the jar is {{{2*245=490}}} pennies.


Knowing that 490 is 35 percent of Quantity of Coins, this becomes a typical beginners elementary basic math question.


Q for how many coins in the jar,
{{{(35/100)Q=490}}}
{{{Q=490(100/35)}}}
{{{Q=(7*7*2*5*100)/(5*7)}}}
{{{Q=(7*2*100)}}}
{{{highlight(Q=1400)}}}-------------1400 coins