Supermarket 2

A supermarket had a buko pie sale. In the morning, they sold 2/3 of the pies, and in the afternoon, they sold 1/6 of the pies. If 150 pies were left, how many pies had been sold? Show your solution.

Correct answer:

x =  750

Step-by-step explanation:


x + 150 = n
x = 2/3 n + 1/6 n

x + 150 = n
x = 2/3·n + 1/6·n

n-x = 150
5n-6x = 0

Pivot: Row 1 ↔ Row 2
5n-6x = 0
n-x = 150

Row 2 - 1/5 · Row 1 → Row 2
5n-6x = 0
0.2x = 150


x = 150/0.2 = 750
n = 0+6x/5 = 0+6 · 750/5 = 900

n = 900
x = 750

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