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Because the camera has a 20% discount, it will cost 80% of it's original price.

170 times 0.8= $136

2and3/5 is 13/5.       13/5 x 1/6 =13/30. Just multiply the denominators.

(2= 10/5, add 3/5 to get 13/5.)  because 10/5 +3/5 = (10 +3)/5.  If you have two (or more) fractions with the same denominator -that's the number on the bottom -then you can just add the numerators. Why?

Think this way, one lemon plus two lemons is three lemons. If I  say 'one fifth plus two fifths is three fifths' I'm just adding 'fifths'.

136 is the answer

The answer is 4

Please delete this post.

I attempted to answer this question and failed horribly due to insane stupidity.

900/2700=0.333333333333333 etc.Now multiply by 100. Gradient is approx 33.33%,or one in three. (Because 900/2700 is just a third.)

round up 479 to 500 giving you 11.25.

  sorry dont know

might be 3.9

:)

Confusion seems to be creeping in here.(and apologies for previous careless answer!)---The 70%(and the 30%) is INDEPENDANT of the number of the factory's products. So no matter what the number of products,we are always dealing with the ratios 70/100 and 30/100.Using this scale to keep the problem as simple as possible,this boils down to 

First choice. Probability of picking a good one= 70/100 ( no matter what the number of products!) Now,keeping the scale as simple as possible,

Second choice,now have 99 choices left with 69 good ones.Prob= 69/99

Third choice follows as                                                        68/98

so prob is 70/100x69/99x68/98,regardless of the number of products. Note that I am NOT assuming that there are only 100 products,but using the percentages to keep the problem simple.You will find,and I am not prepared to do it here,that if you start with any number of products and scale down to percentages,you will get the same answer.

The universe, life, and everything.

X=-51

I hope it helps

I prefer scientific, but graphing calculators are also good.

A common good found in a bakery, often in grocery stores.

3.14159 ect.

Its a thing you can eat

What would be the height of the tank if it is 50cm wide and 60cm long and it can hold up to 126 liters of water but they recommended filling it up to 2/3 of water?

This is a tricky question; here's how I undrestand it:

1liter = 1dm³ = 1000cm³

V = a * b * h

h = V / a * b

h = 126000cm³ /3000cm²

h = 42cm

The height of the tank is 42cm!                                                                                                                                                                                                                                                                                                                                           (The height of the recommended water level is 2/3 of 42cm, which is 28cm.)

Thank you Melody, without your support and confidence in me, my determination to be a MathsGod would've have gone as far!

Yes, that is what I would go for too Geno :)