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A positive number is 5times another …

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A positive number is 5times another number . If 21 added to both the numbers ,then one of the new numbers becomes twice the other new number . What are the numbers

Posted by Nk Nk 5 years, 5 months ago

CBSE > Class 08 > Mathematics

2 answers

Mansi Patil 5 years, 5 months ago

Exercise 1.A

1Thank You

Gaurav Seth 5 years, 5 months ago

x = 5y

x + 21 = 2( y +21)

x + 21 = 2y + 42

Substitute the first equation in the second one,

5y + 21 = 2y + 42

5y + 21 - 2y - 42 = 0

3y -21 = 0

3y = 21

y = 21/3 = 7

x = 5y

Therefore, x = 5 * 7

x = 35

The number is 35.

1Thank You

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CBSE > Class 08 > Mathematics