Zollie and Beau had 100 kilograms of a 20 % glycol solution. How much of a 30 % glycol solution should they add to get a solution that is 25 % glycol? ​

-2

7 - 9 = -2

reversed:

-2 + 9 = 7

14.29%

step-by-step explanation:

see explanation

step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

remove brackets and collect like terms

13 - r - 1 + r

= 12 - r

c

remove brackets and collect like terms

= - 8 - r + 2r - 4

= - 12 + r

d

remove brackets and collect like terms

= 7r - - - 6r

[-   - = - - = - ]

= r -

i have no clue what you just said. write a question in english?