Jawab:

Let's start by assigning a variable to represent the total number of pencils in the box. Let's call it "x".

According to the problem, one half but 7 fewer pencils were sold on the first day. This means that (1/2)x - 7 pencils were sold on the first day, and (1/2)x + 7 pencils remained in the box.

Then, one half of the remaining part and 11 fewer pencils were sold on the second day. This means that (1/2)((1/2)x + 7) - 11 pencils were sold on the second day, and (1/2)((1/2)x + 7) + 11 pencils remained in the box.

Finally, 22 pencils were left in the box. So we can set up the following equation:

(1/2)((1/2)x + 7) + 11 = 22

Let's solve for x:

(1/2)((1/2)x + 7) = 11

(1/2)x + 7 = 22

(1/2)x = 15

x = 30

Therefore, the box originally contained 30 pencils.

Penjelasan dengan langkah-langkah: