Simply it as follows:
1 + 39 = 40
2 + 38 = 40 etc
18 + 22 = 40
19 + 21 = 40
There are 19 of these plus 40 itself . . .therefore 20 of them
20 x 40 = 800
And finally the last number not used, 20
Therefore 800 + 20 = 820
Answer:
I had to repost my answer because i got deleted from some reason
Step-by-step explanation:
Answer:
u have to eat mcdonalds
Step-by-step explanation:
7a=4(2a+11)-a
7a=7a+44
7a-7a=7a+44-7a
0=44
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