Isabelle is mixing red paint with blue paint to make purple paint. she adds 3/10 of a fluid ounce of red to 11/15 of a fluid ounce of blue to make1 1/30 fluid ounces of purple. how many fluid ounces of red paint will she need to make 3 fluid ounces of purple paint? a. 2/5 fluid ounce b. 11/20 fluid ounce c. 27/31 fluid ounce d. 1 13/50 fluid ounces

C. 27/31 fluid ounce

Step-by-step explanation:

First, let's turn the mixed number into a fraction:

Then, to solve the problem we can use a simple rule of three:

31/30 ----------3/10

  3  ----------- x

This can be read as: If to make 31/30 fluid ounces of purple you need 3/10 fluid ounces of red, then to make 3 fluid ounces of purple how many fluid ounces of red will you need?

So, to make 3 fluid ounces of purple paint, Isabelle will need 27/31 fluid ounces of red paint.

the answer is c

hope this !

n=9

step-by-step explanation:

7 times a number = 7n

decreased by 13 = 7n-13

same as is =

5 times the number = 5n

increased by 5 = 5n+5

7n-13 = 5n+5

2n=18

n=9