There are 15 boys and 20 girls in 6th grade. Heather says that means the ratio of the number of boys in 6th grade to the
number of girls in 6th grade is 3:4.
Is Heather correct? If not, what is the correct ratio?

Kelly is a salesperson at a shoe store, where she must sell a pre-set number of pairs of shoes each month. at the end of each work day the number of pairs of shoes that she has left to sell that month is given by the equation s=300-15x , where s is the number of pair of shoes kelly still needs to sell and x is the number of days she has worked that month. what is the meaning of the number 300 in this equation

Ineed me i stuck and i don’t want to get it wrong

Extra points! find the missing dimension! need asap