omg please please help i really need it and i’ll give brainliest if you give a correct answer also here’s some angel numbers: 111 777 999 555

There are 120 red marbles in the jar (last option)

Step-by-step explanation:

System of Equations

Let's call:

x = number of red marbles in the jar

y = number of blue marbles in the jar

It's given there are 320 marbles in the jar, thus:

x + y = 320

Solving for y:

y = 320 - x         [1]

It's also given the ratio of blue marbles to red marbles is 5 to 3, thus:

Cross-multiplying:

3y = 5x           [2]

Substituting [1] in [2]:

3(320 - x) = 5x

Operating:

960 - 3x = 5x

Adding 3x:

8x = 960

Dividing by 8:

x = 960/8 = 120

x = 120

There are 120 red marbles in the jar (last option)

make sure you have version 2.50

try looking in the very back of the book : )

step-by-step explanation:

you can download it here