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kiruha [24]
3 years ago
7

When 50​% of a number is added to the​ number, the result is 210. what is the number?

Mathematics
2 answers:
Elenna [48]3 years ago
7 0
The answer is 140 :) 140÷2= 70, 140+70= 210. hope this helps :)
stellarik [79]3 years ago
4 0
I hope this helps you

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Divid 15 into two parts such that the sum of their reciprocal is 3/10
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Let x and y be the 2 parts of 15 ==> x + y=15 (given)

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 ==> (10y+10x)/10xy = 3xy/10xy ==> 10x+10y =3xy

But x+y = 15 , then 10x+10y =150 ==> 150=3xy and xy = 50

Now we have the sum S of the 2 parts that is S = 15 and 
their Product = xy =50
Let's use the quadratic equation for S and P==> X² -SX +P =0
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