Answer: the vendor sold 40 apples and 20 oranges.
Explanation:
Let x represent the number of apples that the fruit vendor sold.
Let y represent the number of oranges that the fruit vendor sold.
The fruit vendor sells 60 pieces of fruit that are either apples or oranges. It means that
x + y = 60 - - - - - - - - - - -1
There are 1.5 times as many apples as oranges. It means that
x = 2y
Substituting x = 2y into equation 1, it becomes
2y + y = 60
3y = 60
y = 60/3
y = 20
x = 2y = 2 × 20
x = 40