Question

the yeacher tells the class that the highest marks obtain by a student in the class is twice the lowest marks plus 7the highest marks is 87what is the lowest marks?

Answer 1

let lowest mark =x
so highest marks=2x+7
Highest marks =87
so
..
87=2x+7
87-7=2x
80=2x
80/2=x
40=x
so lowest marks are 40