Bunuel wrote:

An office supply store received a shipment of boxes of pencils. How many pencils were in the shipment altogether? (1 gross = 12 dozen)

(1) The number of boxes of pencils in the shipment was 6 gross.

(2) There were 3 dozen pencils in each box of pencils in the shipment.

The shipment was in boxes and we are asked to find number of pencils. Hence we need total boxes shipped and number of pencils in each box.

Statement 1: number of boxes is given. So we get one condition. but number of pencils in each box is not given. Insufficient

Statement 2: number of pencils in each box is given. but number of boxes is not given. Insufficinet

Combing 1 & 2 we get both our required condition. Sufficinet

Although calculation is not required but number of pencils can be calculated as = 6*12*12*3*12

Option C