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masya89 [10]
2 years ago
11

If 3/5 of a number is 42,what is the twice number

Mathematics
2 answers:
ELEN [110]2 years ago
7 0

Answer:

2x=140

Step-by-step explanation:

Let the number be x

3/5x=42

X=42×5÷3

X=210÷3

X=70

Multiplying both sides by 2, we get:

2x=140

JulsSmile [24]2 years ago
3 0

Answer:

  140

Step-by-step explanation:

Let the number be represented by x. You are given ...

  (3/5)x = 42

Multiplying by 10/3 gives ...

  (10/3)(3/5)x = (10/3)(42)

 2x = 140 . . . . the value of twice the number

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The first term of a geometric sequence is 15, and the 5th term of the sequence is <img src="https://tex.z-dn.net/?f=%5Cfrac%7B24
sladkih [1.3K]

The geometric sequence is 15,9,\frac{27}{5},\frac{81}{25},  \frac{243}{125}

Explanation:

Given that the first term of the geometric sequence is 15

The fifth term of the sequence is \frac{243}{125}

We need to find the 2nd, 3rd and 4th term of the geometric sequence.

To find these terms, we need to know the common difference.

The common difference can be determined using the formula,

a_n=a_1(r)^{n-1}

where a_1=15 and a_5=\frac{243}{125}

For n=5, we have,

\frac{243}{125}=15(r)^4

Simplifying, we have,

r=\frac{3}{5}

Thus, the common difference is r=\frac{3}{5}

Now, we shall find the 2nd, 3rd and 4th terms by substituting n=2,3,4 in the formula a_n=a_1(r)^{n-1}

For n=2

a_2=15(\frac{3}{5} )^{1}

   =9  

Thus, the 2nd term of the sequence is 9

For n=3 , we have,

a_3=15(\frac{3}{5} )^{2}

   =15(\frac{9}{25} )

   =\frac{27}{5}

Thus, the 3rd term of the sequence is \frac{27}{5}

For n=4 , we have,

a_4=15(\frac{3}{5} )^{3}

    =15(\frac{27}{25} )

    =\frac{81}{25}

Thus, the 4th term of the sequence is \frac{81}{25}

Therefore, the geometric sequence is 15,9,\frac{27}{5},\frac{81}{25},  \frac{243}{125}

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