Question 534017
Try this:
Cubes to (cubes+spheres) = 16 to 25.  Let x = number of cubes in 225 cubes plus spheres.
{{{16/25 = x/225}}} Solve for x.
{{{16(225)/25 = x}}}
{{{x = 144}}}
There are 144 cubes in the box.
Check:
{{{16/9 = 144/81}}} Divide the numerator and denominator of the second fraction by 9.
{{{16/9 = 16/9}}}