20km/40min=0.5km per minute
6km/120min=6/120=1/20 or 0.05km per minute
0.5km/min is 10 times faster then 0.05km.min
His first rate exceeded his second rate by 10 times, or 1000%
Let's handle this case by case.
Clearly, there's no way both children can be girls. There are then two cases:
Case 1: Two boys. In this case, we have 13 possibilities: the first is born on a Tuesday and the second is not (that's 6 possibilities, six ways to choose the day for the second boy), the first is not born on a Tuesday and the second is (6 more possibilities, same logic), and both are born on a Tuesday (1 final possibility), for a total of 13 possibilities with this case.
Case 2: A boy and a girl. In this case, there are 14 possibilities: The first is a boy born on a Tuesday and the second is a girl born on any day (7 possibilities, again choosing the day of the week. We are counting possibilities by days of the week, so we must be consistent here.), or the first is a girl born any day and the second is a boy born on a Tuesday (7 possibilities).
We're trying to find the probability of case 1 occurring given that case 1 or case 2 occurs. As there's 13+14=27 ways for either case to occur, we have a 13/27 probability that case 1 is the one that occurred.
Answer: 2
Step-by-step explanation:
A dice has 6 numbers on it, 1,2,3,4,5, and 6.
how many pairs of 3 can you make?
(1 2 3) (4 5 6)
There are 2 pairs, so your answer is 2
Answer:
Step-by-step explanation:
if the item is 430, and the sales tax is 25.80
we can find how much is 1%
430/100=4.30
25.80/4.30=6
the sales tax is 6%
