Answer: 50 houses are left to be sold.
Step-by-step explanation:
The total number of new houses that were built in the neighborhood last month is 90.
1/6 of them were sold this month. This means that the number of houses that were sold this month is
1/6 × 90 = 15
The number of houses remaining would be
90 - 15 = 75
1/3 of the remaining houses were sold. This means that the number of houses that were sold is is
1/3 × 75 = 25
Therefore, the number of houses that are left to be sold is
75 - 25 = 50
