Problema Solution
if steve is writing a test and the rules of the test are if you get one wrong they take two marks away if you get one right you get one mark if he got 21 out of 30 how many did she get wrong
Answer provided by our tutors
let
x = the number of wrong answers
y = the number of right answers
30 = the total number of questions
y - 2x = 21
x + y = 30
by solving we find
x = 3
y = 27
click here to see the step by step solution of the system of equations
she got 3 wrong and 27 right.