To how much water should 100 ml of 18m sulfuric acid be added to prepare a 1.5m solution

Take 100 ml of a 18 molar solution. The total number of moles is (1 liter/1000 ml) 100 ml 18 moles is 1.8 moles.

1.5 moles in 1 liter so If 1.1 liters of water is added, the total volume is 1.2 liters and 1.8 moles are dissolves in it. 1.8 moles/ 1.2 liters is 1.5 moles per liter.

fe 55.85 g/mol and h2o 18.02 g/mol.

it is the most commonly accepted one