M= Michael's score

K= Kathryn's score

We have:

1. M+K=425

2. M=2*K-70

Solving:

from the 1st:

K=425-M

Substitute in the 2nd: M=2*(425-M)-70

or:

M=850-2*M-70

M+2*M=850-70

3*M=780

M=260 (this is already telling us it's the 3rd choice above, but we'll check K anyway)

K=425-260=165

So indeed it's the 3rd choice.

you the answer is this one Kathryn: 165, Michael: 260

Yes

Secure Information

Content will be erased after question is completed.

Enter the email address associated with your account, and we will email you a link to reset your password.

Forgot your password?

Sign Up