Find the number which is nearest to 3105 and is exactly divisible by 21.
Answer & explanation
Correct answer: option 2
The correct answer is Option (2) → 3108
Dividing 3105 by 21 gives the multiples of 21 on either side of it; the nearer of the two is the answer.
\(3105=21\times147+18\), so the multiple just below is \(21\times147=3087\), which is 18 away
The multiple just above is \(3087+21=3108\), which is only \(21-18=3\) away
So the nearest number divisible by 21 is 3108