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The H.C.F. of two numbers is 11 and their L.C.M. is 693. If one of the numbers is 77,find the other.

A.

80

B.

57

C.

63

D.

99

See Answer & Explanation Lets Discuss
Correct answer is : C
Explanation

Let the required numbers be 15.x and 11x.

Then, their H.C.F. is x. So, x = 13.

The numbers are (15 x 13 and 11 x 13) i.e., 195 and 143.

 

Raj Verma 10/10/2013 2:48:16 AM

ans is 99....because  in case of two number :  L.CM * H.C.F = First no. * second no.

so that  11 * 693= 77 * sec. no

second number = 99

 

Vela 1/31/2014 9:23:46 PM

Yes Ans is 99 only..

Another no. = (11*693)/77 = 99

SPANDANA 4/11/2014 3:08:54 PM

YA..99

JAKIN 6th Std 6/24/2014 8:34:30 PM

The Answer is 99 only.

Let x and y are two numbers. If the HCF,LCM and one number is given, the formula to find the second number is y=LCM * HCF / x.

Hence,

   y= 693 * 11 / 77 = 99.

Please change the answer option

Gayatri Rajpoot 8/27/2014 12:24:17 PM

yes ans. is 99 bcz lcm*hcf=x*y

so 11*693=77*y

shraddha 10/15/2014 5:14:22 PM

ans is 99

Deepak Singh 11/7/2014 10:04:19 AM

(HCF*LCM) of n1 and n2=multiplication of(n1*n2)

here one no. is given, lets take it n1=77, and HCF =11 and LCM=693

so.    (11*693)=(77*n2)

hence n2=99

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