At a school Number of boys : number of girls 11:9
There are 124 boys than girls
Work out the total amount of students at the school

If a baby uses 15 diapers in 2 days how many diapers will the baby use in a year

What is the upper quartile in the box plot?

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )