the equation would be y = 30 + x and if your brother will read for 15 minutes then you'll read for 45 minutes i believe.
There are 8000 millimeters because 1 liter is also 1000 millimeters
Step-by-step explanation:
3x=18+4y
x=18+4y/3
18+4y-4y=18
18=18
so there is equare