In fifth grade at lenape elemantary school, there are 4/7 as many girls as there are boys .There are 66 students in fifth grade. How many students are girls?

there are 24 girls.

Step-by-step explanation:

Let x represent the number of boys in fifth grade at lenape elemantary school.

In fifth grade at lenape elemantary school,there are 4/7 as many girls as there are boys. This means that the number of girls in the school would be

4/7 × x = 4x/7

There are 66 students in fifth grade. This means that

x + 4x/7 = 66

Cross multiplying by 7, it becomes

7x + 4x = 462

11x = 462

x = 462/11

x = 42

The number of girls would be

66 - 42 = 24

mr. flanders’ class sold 47 doughnuts and   mr. rodriquez’s class sold 38 cartons of milk

step-by-step explanation:

let x be the number of doughnuts sold by mr. flanders’ class and y be the number of cartons sold by mr. rodriquez’s class.

1. together, the classes sold 85 items, then

x+y=85.

2. both classes earn earned $104.49 for their school. if doughnuts were sold for $1.35 each, then x doughnuts costed $1.35x. if cartons of milk were sold for $1.08 each, then y cartons costed $1.08y. hence,

1.35x+1.08y=104.49.

3. solve the system of two equations:

my answer is$ 12

step-by-step explanation:

because 15 -2=12