A package contains 1.33 lb of ground round. If there's 29% fat, how many grams of fat are in the round?

I got 175 g but the textbook says the answer is 91 g of fat. How?

The answer is: 175 grams of fat are in the round.

m (ground round) = 1.33 ib.

First convert ib (pounds) to g (grams):

1 pound (lb) is equal to 453.592 grams (g).

m (ground round) = 1.33 ib · 453.592 g/ib.

m (ground round) = 603.28 g.

ω (fat) = 29% : 100%.

ω (fat) = 0.29; mass percentage of fat.

m (fat) = ω (fat) · m (ground round).

m (fat) = 0.29 · 603.28 g.

m (fat) = 175 g; mass of fat.