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Q.

Radha is drawing a dot rangoli (a beautiful pattern of lines joining dots) with chalk powder, She has Question Imagedots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are Question Imagedots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are rows? If there are Question Image rows? If there are rows?


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a

92, 72, 90

b

Question Image,72, 90

c

Question Image,72, 90

d

Question Image,72, 90 

answer is A.

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Detailed Solution

 Concept- By dividing the number of dots by the number of rows in a pattern or design rangoli, you can get the number of dots in each pattern..
Given
Question Image= Question Image(when multiply with r)
Substituting the values
Question Image =Question ImageTherefore, the number of dots in 8 rows is 72 dots.(8x is number of dots in row)
For 10 row.
=Question ImageQuestion ImageQuestion ImageAs a result, there are 9 dots in a row, 72 dots in an eight-row column, and 90 dots in a ten-row column.
Hence, the correct answer is option number 1).
 
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Radha is drawing a dot rangoli (a beautiful pattern of lines joining dots) with chalk powder, She has dots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are dots in a row. How many dots will her Rangoli have for r rows? How many dots are there if there are rows? If there are rows? If there are rows?