Question

my mates answer it plz plz plz​

Answer 1

Answer:

10

Step-by-step explanation:

420=2*2*3*7*5 850=2*5*17 common in both is 2 and 5 so answer is 5*2=10

Answer 2

Answer:

      850=420.2+10

      420=10.42+0

hcf is 10