Question

the teacher tells the class that the highest mark obtained by a student in her class is twice the lowest marks plus 7. the highest score is 87 . what is the lowest score?

Answer 1

let the lowest score be x

highest score = 2x +7
=>87=2x+7
=>87-7=2x
=>80=2x
=>80/2=x
=>40=x

hence the lowest score =x=40

Answer 2

let the lowest mark be x
=2 X+7= 87
= 2X=87-7
=2X=80
=X=80/2
X=40