Question

HELP PLS MIGHT GIVE BRAINLIST BUT ONLY IF 2 PEOPLE ANSWER!

Answer 1

15 in by 30 in = 150
15 in by 18 in = 90
21 in by 30 in = 210

The answer to (21 in by 15 in) is = 105
21 x 15 = 315

Hope this helps

Rule:
Multiply then divide by 3