Put a digit in the gap, such that the answer is a whole number:
10x+11=144...
possible digits are: ?

Find the quotient with the restriction.

White shapes and black shapes are used in a game. some of the shapes are circles. while the rest are squares. the ratio of the number of white shapes to the number of black shapes is 5: 11. the ratio of the number of white cicrles to the number of white squares is 3: 7. the ratio of the number of black circles to the number of black squres is 3: 8. work out what fraction of all the shapes are circles.

Common binomial factor of 6x(3x+7)+5(3x+7)