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Look under your first post!.

a - Since there is a DECREASE of 2 taps from 5 to 3 for a ratio of 3/5, then there should be a correspending INCREASE in time to the reciprocal of 3/5 or 5/3.
Therefore, it should take:5/3 x 150 =250 minutes for 3 taps to fill the pool.

b - at the same RATE.

Deleted.... answer incorrect :(

Each month it grows 6.1/12, so about 0.51%

Note that in triangle  ABC  longer leg is  2√3 cm  and the area is  2√3 cm²

If the value of a leg of the right triangle is 2, than the numeric value of the other leg and the area of that triangle is the same!   

The pattern is: 15C0,  15C1,  15C2,  15C3..........and so on.

The 4th element is: 15C(4 - 1) =15C3 = 455.

I may be wrong, yet:

17-9=8 albums

8+6=14 albums.

A, E, I, O, U, Y-six vowels and twenty consonants.

20*6*20*10=24000

I'm sorry, the first term is 147...

147-3y=39

108/3=36

1+36=37 counting numbers numbers

87 points

Try to find the total number of points and the average.

See answer below, should be 37 numbers...

36-20=16 students-take part in only the mathematics club.

27-20=7 students only take part in the physics club.

16+7+20=43 students

Thus, 50-43=7 students take neither mathematics or physics clubs.

n can be either 12 or 14, thus 12+14=26-sum of the values for n.

50-6=44 students participate in at least some activity...

Let y be the number of students who participate in both MATHCOUNTS and the science club.

(28-y)+(21-y)+y=44

49-y=44

y=5.

Five(5) students participate in both MATHCOUNTS and science club.

I am not 100% as I am learning about this too so here I go. a=1-r is the decay formula a=1-.1=.9 .9^12=.282429=.28 rounded to two decimal places. I raised the.9 to the 12th because there are 12 months in 1 year. Do you have multiple attempts? 

There are 15 ways you can make up the primes of: 2, 3, 5, 7, 11 on rolling 2 dice as follows:

11 , 12 , 14 , 16 , 21 , 23 , 25 , 32 , 34 , 41 , 43 , 52 , 56 , 61 , 65 , Total =  15

The prabability is: 15 / 6^2 =5 / 12

This worksheet will help a LOT. Look at the Venn diagrams section. 

The mean of the set is all the numbers added up divided by the total number of terms.

There are 8 terms and 118+x is the sum.

So (118+x)/8 is the mean, which is 4.5 less than x, or x-4.5

Our equation is \(\frac{118+x}{8}=x-4.5\).

I believe you can solve this.

You are very welcome!

:P

The answer would be 

100, 120, 140, 160, 180, 200, 240, 260, 280, 300, 320, 340, 360, 380, 400, 420, 460, 480, 500, 520, 540, 560, 580, 600, 620, 640, 680, 700, 720, 740, 760, 780, 800, 820, 840, 860, 900, 920, 940, 960, and 980.

The total number would be 41.

THAT'S A LOT OF NUMBERS!!!