At party, ratio boys to girls 5:3, 20 boys leave and ratio becomes 5:4 how many girls are at the banquet

Question

Solving ratio word problems without using algebraic expressions

Answer 1

36 girls

originally there were a total 96 = B + G

at a ratio of 60:36 = B:G

then 20 B left leaving

40:36 which is the same as 5:4, after dividing by 8