Let n = number of glasses needed 1 glass gives us 1*0.4 = 0.4 liters of water 2 glasses give us 2*0.4 = 0.8 liters 3 glasses give us 3*0.4 = 1.2 liters 4 glasses give us 4*0.4 = 1.6 liters and so on... In general, n glasses give us n*0.4 = 0.4*n liters of water
So 0.4*n is going to be the same as 3.4 as we want to fill the 3.4 liter pitcher. Set 0.4*n equal to 3.4 and solve for n
0.4*n = 3.4 0.4*n/0.4 = 3.4/0.4 <<--- divide both sides by 0.4 n = 8.5
If we want n to be a whole number, then round up to the nearest whole number. So we'll need 9 full glasses of water to fill the 3.4 liter pitcher. There is extra water in this case which isn't used.
So the answer is either 8.5 or 9 depending on if your teacher wants you to round to the nearest whole number.
