Question 1027309
Her " miles per gallon " is:
{{{ 336/12 = 28 }}} mi/gal
In terms of units:
[ miles driven ] / [ miles / gallon ] = [ gallons used ]
{{{ 252 / 28 = 9 }}} gallons
She has 5 gallons, so
{{{ 9 - 5 = 4 }}}
She needs 4 gallons more