Question

A cylindrical jar of peanut butter measures 7 cm in diameter and 12 cm in height. If 1 cm³ = 0.034 ounce,

about how many ounces of peanut butter can the jar hold?
64 ounces
8 ounces
16 ounces
32 ounces

Answer 1

• Radius=r=7/2=3.5cm
• h=12cm

Volume

• πr²h
• π(3.5)²(12)
• 12π(12.25)
• 461.58cm³

Convert to ounces

• 461.58×0.034
• 15.7oz
• 16oz

Option C

Answer 2

16 ounces (nearest ounce)

Explanation:

Formula

Volume of a cylinder = πr²h (where r is the radius and h is the height)

Diameter = 2r (where r is the radius)

Given:

• diameter = 7 cm
• height = 12 cm

⇒ radius = 7 ÷ 2 = 3.5 cm

⇒ Volume of the jar = π · 3.5² · 12 = 147π cm³

If 1 cm³ = 0.034 ounce, then

⇒ Ounces jar can hold = 147π × 0.034

= 15.70168008

= 16 ounces (nearest ounce)