Which is the better deal

$2.99 for 22oz or 3.99 for 32

$1.09 for 8 oz or 1.59 for 16

$0.56 for 8 oz or 1.99 for 25

Q1. The answer is 3.99 for 32

Express both prices as prices for 1 oz, so they can be compared.
$2.99 for 22oz. x for 1oz.
$2.99 : 22oz =  x : 1oz
x = $2.99 * 1oz : 22oz
x = $0.14

$3.99 for 32oz. x for 1oz.
$3.99 : 32oz =  x : 1oz
x = $3.99 * 1oz : 32oz
x = $0.12

So, 3.99 for 32 is the better deal.

Q2.  The answer is 1.59 for 16.

Express both prices as prices for 1 oz, so they can be compared.
$1.09 for 8oz. x for 1oz.
$1.09 : 8oz =  x : 1oz
x = $1.09 * 1oz : 8oz
x = $0.14

$1.59 for 16oz. x for 1oz.
$1.59 : 16oz =  x : 1oz
x = $1.59 * 1oz : 16oz
x = $0.10

So, 1.59 for 16 is the better deal.

Q2.  The answer is $0.56 for 8 oz.

Express both prices as prices for 1 oz, so they can be compared.
$0.56 for 8oz. x for 1oz.
$0.56 : 8oz =  x : 1oz
x = $0.56 * 1oz : 8oz
x = $0.07

$1.99 for 25oz. x for 1oz.
$1.99 : 25oz =  x : 1oz
x = $1.99 * 1oz : 25oz
x = $0.08

So, $0.56 for 8 oz is the better deal.