The cost of a sweater vest and a blouse is $57. The sweater vest cost twice as much as the blouse. What is the price of the blouse

sweater = s, blouse = b

s + b = 57, s = 2b

2b + b = 57, 3b = 57, b = 19.

s = 2b = 2(19) = 38.

sweater costs 38 dollars, and blouse costs 19 dollars

blue marble is 15 times out of 50 = 15/50 reduces to 3/10

landing on tails is 24 out of 50 = 24/50 reduces to 12/25

to find the probability of both multiply together:

3/10 x 12/25 = 3 x 12 / 10 x 25 = 36/250

if you multiplied the numerator and denominator by 10 you get 360/2500.

the answer is 360/2500