Math problem

[JS_Jackson]

What's 9+10
my teacher told me that question lol

 

[UpperGround]

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⚬ 21

 

[X_pogchamp_X]

its 19 not 21 xd why do ppl say its 21

 

[NpGamingBoy]

its 19

Disagreed

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⚬ 21

Agreed

Gshasus filter bypass hsheiens ysbe e uus eiejd ei

 

[Silver Wing]

9+10=21

Proof:
9(base x) + 10(base x) = 21(base y)
9 + 1x = 2y + 1 {Subtract both sides by 1}
8 + x = 2y
(8 + x)/2 = y
4 +(x/2) = y

Put any number in place of x and y to make the equation true
like x=10 and y=9