A craft store has 12 identical sacks of loose buttons. Each button is perfectly circular and is either solid black (b) or solid white (w). Each sack contains 9 more black buttons than white ones. The total number of buttons in all socks is 372. The number of buttons of each color in 1 sack can be found by using the following system of equations: b-w=9
12(b+w)=372
Which ordered pair, (b, w) is a reasonable solution for the number of buttons of each color in 1 sack?

A. the probability that a product is defective is 0.1. what is the probability that there will be 1 or less defective products out of the next 8 produced products b. the expected number of imperfections in the coating nylon for parachutes is 6 per 100 yards. what is the probability of finding 12 or fewer imperfections in 260 yards c. in a lot of 54 products there are 9 defective products. calculate the probability that not more than 1 is defective from a random sample of 17 products.