Question

10.
Find the greatest number of four digits which is divisible by 15, 20 and 25.​

Answer 1

Step-by-step explanation:

The greatest 4-digit number exactly divisible by 10, 15, 20 is?

Q - The greatest 4-digit number exactly divisible by 10, 15, 20 is?

Soln: Any multiple of 60 will be divisible by 10, 15 and 20.

10 x 6 = 60

15 x 4 = 60

20 x 3 = 60

60, therefore is the of numbers 10, 15, 20.

Now, the greatest 4-digit number is 9999.

So the number closest to (but less than) 9999 that is a perfect multiple of 60 will be the answer.

By checking all the multiples of 60 until it crosses 9999, we can find our answer. We can see

60 x 166 = 9960

60 x 167 = 10020

Therefore, your answer is 9960.

Alternately, to find the answer, we can divide 9999 by 60.

9999 / 60 = 166.65

So we know (60 x 166) will be less than 9999 and (60 x 167) will be more than 9999.

hope this helps you better

Answer 2

Answer:

9999 is the correct answer