Question

If hcf 15 ,21 is 18 -3x find x

Answer 1

Answer:

x=5

Step-by-step explanation:

hcf(15,21):

on prime factorising we get

15= 3*5

21=3*7

therefore hcf=3

a.t.q,

18-3x=3

3x=18-3

   =15

therefore x=15/3

                 x=5

thanks. hope it helps

Answer 2

Answer:

Step-by-step explanation:

hcf of 15,21 = 18-3x

so, 18-3x = 3

=>3(x-6) = 3   taking common 3

=>x-6 = 0 ( 3 cancels 3)

=>x = 6

i hope that's the answer to the question

thanks