Question

HCF of 9/10,12/25,18,35,21/40

Answer 1

HCF of 9/10 ,12/25 ,18 ,35 ,21/40
=HCF of nominator /LCM of denominator

HCF (9,12,18,35,21)
9=3 x 3
12= 2 x 2 x 3
18=2 x 3 x 3
35=7 x 5
21=7 x 3

common factor=1
hence HCF (9,12,18,35,21)=1
now
LCM (10,25,1,1,40)=200

hence of given number is
=1/200

Answer 2

Answer:

Step-by-step explanation:HCF of 9/10 ,12/25 ,18/35 ,21/40

=HCF of neumerator /LCM of denominator 

HCF (9,12,18,21)

9=3 x 3 

12= 2 x 2 x 3 

18=2 x 3 x 3 

21=7 x 3 

common factor=3

hence HCF (9,12,18,21)=3

now 

LCM (10,25,35,40)

10=2 x 5

25=5 x 5

35= 5 x7

40=2 x 2 x 2 x 5

hence LCM (10,25,35,40) is = 2 x 2 x 2 x 5 x 5  x 7 = 1400

hence of given number is 

=3/1400