Question

Three cartons of juice cost $4.77? find the cost of 8 cartons

Answer 1

Note: Make the rule of three simple

cartoons __ price $
3 --------------- 4.77
8 --------------- y

Solving: (directly proportional)

$\frac{3}{8} = \frac{4.77}{y}$
Product of extremes equals product of means
$3*y = 8*4.77$
$3y = 38.16$
$y = \frac{38.16}{3}$
$\boxed{\boxed{y = 12.72}}\end{array}}\qquad\quad\checkmark$

Answer:
The price of eight cartoons was $\ \:12.72$