3 years ago

The sum of three consecutive integers is 18. Find the integers.

Mathematics

1 answer:

luda_lava [24]3 years ago

6 0

Answer:

5,6,7

Step-by-step explanation:

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3 years ago

Find how many two digit numbers are divisible by 3

Bad White [126]

I'll use arithmetic series to find it.

First two-digit number divisible by 3 is 12, last such number is 99. Every 3rd number is divisible by 3.

So,

$a_1=12\\a_n=99\\d=3\\n=?\\\\a_n=a_1+(n-1)\cdot d\\99=12+(n-1)\cdot 3\\3n-3=87\\3n=90\\n=30$

<u>There are 30 such numbers.</u>

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3 years ago