3.5 or 3 1/5 litres
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To find the fraction of 150ml and half a liter, we first need to convert half a liter to milliliters. Since 1 liter is equal to 1000 milliliters, half a liter is equal to 500 milliliters. Therefore, the total volume is 150ml + 500ml = 650ml. The fraction of 150ml in relation to 650ml is 150/650, which can be simplified to 3/13.
4 L
To round 1642 ml to the nearest liter, you first need to understand that 1 liter is equal to 1000 ml. Therefore, you would compare 1642 ml to half of 1000 ml, which is 500 ml. Since 1642 ml is greater than 1500 ml but less than 2000 ml, it rounds up to 2 liters.
3/8 rounded to the nearest half is 0.5
38.412 rounded to the nearest half is 38.5