How do i solve 3y = 15x -2
2 answers:
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So, we have the percentage she gets which is, 90% and the number of questions she answers correctly, which is 27
To find the number of questions in the exam, make an equation
(90% =
= 0.9)
= 
cross multiply and equate them
90x = 27 x 100
90x = 2700
divide by 90 on either sides to isolate x in order to find the answer
90 and 90 cancels out
x = 30
So your final answer will be, there were 30 questions in the exam paper.
To find the number of questions in the exam, make an equation
(90% =
cross multiply and equate them
90x = 27 x 100
90x = 2700
divide by 90 on either sides to isolate x in order to find the answer
90 and 90 cancels out
x = 30
So your final answer will be, there were 30 questions in the exam paper.