How many

How many double-digit numbers that divide by nine give the rest of seven?

Correct answer:

n =  10

Step-by-step explanation:

a1=1 9+7=16 a2=2 9+7=25 a3=3 9+7=34 a4=4 9+7=43 a5=5 9+7=52 a6=6 9+7=61 a7=7 9+7=70 a8=8 9+7=79 a9=9 9+7=88 a10=10 9+7=97  n=10

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