1.

The L.C.M. of 54,90 and a third number is 189and their H.C.F. is 18. What is the third number(b) 180(d) 108(a) 36(c) 126​

Answer»

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  • Number is 18x because one FACTOR is also 18 the COMMON factor HCF

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

∴18×3×5×x=1890⇒270x=1890⇒x=7

Then third number is 18×7=126

SOO ANSWER IS: C) 126

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