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Arithmetic Mean and Range

Solve the fol...

Question

Solve the following.

30% of which number is 21?

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Solution

Let the number be x.

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\frac{21}{20} + (- \frac{19}{30})

Solve the equation: $3 + \frac{30}{x^{2}} = - \frac{21}{x}$

30 - 5 x + 2 x = 2 - 2 (1 - x)

Q. Frame and solve the equations for the following statements:
The sum of the two numbers is

21

and their difference is

3

. Find the numbers

Q. Which of the following complex ions is expected to absorb visible light?

Z n = 30

S c = 21

T i = 22

C r = 24

)

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