The displacement method for measuring volume:

is not always accurate
can be used to measure the volume of solids
may yield incorrect results if the matter is soluble in liquid
all of the above

explanation:

venn diagram is pictorial representation with of circles showing the relation between two finite sets or things. the intersection part of two circles conveys the relation present in between those sets or things.

here in the venn diagram of sand and salt two circles represent sand and salt. but the area falling under the intersection of these circle represents the mixture of sand and salt.

so, in a venn diagram the mixture will be placed in a middle that is in between the intersection of two circles.

i believe the answer is three water molecules