14 and 21, and 21 and 28 are the number pairs between 15 and 30 that have 7 as their greatest common factor.
Only the number 1.
30/21 = 1 with a remainder of 9
33
To find what the factors of a number are you can list the factor pairs: 1 x 21 3 x 7 The factors of 21 are 1, 3, 7, and 21.
3 is the hcf
21 is 30 % of the number which is found to be seventy.
21 is 30% of 70
Every rational number "goes into" every other rational number. In this case, the quotient is 0.7 .
21 is 70% of 30.
To find the percent that a number, x, is out of another number, y, divide x by y and multiply by 100. So (21/30)*100 = 70, which means that 21 is 70% of 30.
The next number in the sequence 3-15-6-30-21 is -207.
3
75/30 = 21/2
30% is 0.30 so, 0.30 x 70 = 2100 move the decimal to the left 2 times and get 21 and 21 is your answer!
210
21 and any multiple of 21.