Question

The largest number of four digits which is exactly divisible by 15 25 and 35

Answer 1

Find lcm of 15 25 and 35
Find largest 4 digit number divisible by this lcm, that will be the answer.

Here lcm is 525
Now to find largest 4 digit number divisible by 525 do
$525 \times (quotient \: of \: 9999 \div 525)$
Answer is 525 × 19 =9975