Question

7. The L.C.M. of 54,90 and a third number is 1890
and their H.C.F. is 18. What is the third number
(a) 36
(b) 180
(d) 108

(c) 126​

Answer 1

Answer:

(c)126...

Step-by-step explanation:

Given the LCM two no. 54,90 and the third number is 1890 and H.C.F is 18.

Let the number is 18x because one factor is also 18 the common factor H.C.F .

Then factor 54,90,18 = 18*3,18*5,18*x

... 18*3*5*x = 1890 = 270x = 1890 = x= 7

Then the third number is 18*7= 126

I hope it helps you...