Answer:
36
Step-by-step explanation:
Let 1 be the fraction of the whole 72 new houses in the neighborhood.
1/3 of them were sold last month.
The remaining houses = 1 - 1/3 = 2/3.
If 1/4 of the remaining houses were sold this month = 1/4 × 2/3 = 1/6
The fraction of houses left to be sold = 1 - (1/3 + 1/6) = 1 - 1/2 = 1/2
The number of houses left to be sold = 1/2 × 72 = 36
