Answer:
7.
Step-by-step explanation:
21 = 3 * 7
28 = 2 * 2 * 7
42 = 2 * 3 * 7
Collecting common factors:
t is common to all 3 sets of factors so
HCF = 7.
Answer is YES
Because
2 ones = 2 x 1 = 2 and 20 tenths = 20 x 0.1 = 2
2/5
4/5 divided by 1/3=12/5
12/5 is 2 2/5
im pretty sure its 64 if not im so sorry
