Answer: 8.7 crayons
Step-by-step explanation:
To find the mass of the crayons alone, we need to subtract the mass of the box from the total mass of the crayons plus the box:
Total mass of crayons + box = 960 grams
Mass of box only = 254 grams
Mass of crayons = Total mass of crayons + box - Mass of box only
Mass of crayons = 960 g - 254 g = 706 grams
Now, we know the mass of 10 crayons is 81 grams. We can use this information to estimate the number of crayons in the box:
Number of crayons = (Mass of crayons) / (Mass of 10 crayons)
Number of crayons = 706 g / 81 g ≈ 8.7 crayons
Rounded to two significant figures, the estimated number of crayons in the box is approximately 8.7 crayons.
