Desmos Graphing Calculator

CalcReferenceCopy

Math·Algebra·Linear inequalities in one or two variables

medium

Rebecca is collecting $40$-milliliter samples of river water and $15$-milliliter samples of lake water. She needs to collect a total of at least $770$ milliliters of river water and lake water, where the number of samples of lake water is twice the number of samples of river water. Which inequality represents this situation, where $x$ is the number of samples of river water that Rebecca needs to collect?

A

$40(2x)+15x\le 770$

B

$40(2x)+15x\ge 770$

C

$40x+15(2x)\le 770$

D

$40x+15(2x)\ge 770$