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The sum of 2 numbers is 8 . If their sum is 4 times their difference find the number

Posted by Indragaj Nagar 5 years, 3 months ago

CBSE > Class 10 > Mathematics

3 answers

Niharika Raj 5 years, 3 months ago

Let the numbers be X and Y. In first case X + Y = 8 In second case X + Y= 4(x-y) After solving the both equation you will get x is equal to 5 and Y is equals to 3

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Santosh Suhana 5 years, 3 months ago

Let number will be x and y. Given, x+y =8.......(i) 4(x-y) =x+y. Or, 4x-4y =8.........(ii) [x+y =8 in eq. i ] Now, multiply by 4 in eq. i Then we get, 4x+4y =32......(i) Now, Substract eq.(ii) from eq.(i) 4x+4y =32, 4x-4y =8, - + - ____________ 8y =24 Or, y =3. Put the value of y in eq.(i) X+y =8 x+3 =8 X. =8-3 =5. Hence, number will be 5 and 3.

1Thank You

Lakhan Jee Madhav 5 years, 3 months ago

Let x+y=8. ____(1eq) .4 (y-x)=x+y______2nd(eq) Solve both Equation X=0 Y=8 Right answer

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CBSE > Class 10 > Mathematics