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 5 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
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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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