What is the mistake in this problem?

The mistake is that 54 was not subtracted from both sides. It should be. Also, I have no idea what those shenanigans with the -3b = 60 simplification is, but you have to divide both sides by -3. b = 16

Step-by-step explanation:

This is how this is supposed to be solved.

 54 - 3b = 6

-54            -54

-3b = -48

(-3b)/-3 = -48/-3

b = 16

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

5/20 so 25%

step-by-step explanation: