6 times because you find the common denominator which is 8 so 3/4 is 6/8. He needs to fill his cup 6 times.
18 has more factors than all of those numbers.
1, 2, 3, 6, 9, 18 are all the factors of 18.
We have 3 white balls in the first urn out of 9. That means we have a 1 in 3 chance at picking the white ball in the first urn.
Now, we have a 3 in 11 chance at picking the white ball in the second urn.
Since, we want them simultaneously, we need to multiply them.
1/3 × 3/11 = 1/11 chance
This means you should do 240*3/8 which is 90. so 90 times 240=21600
the answer is 216000km^2
