Find the value of:

687x47+566x58

Using the digits 58647 without repetition the greatest 5-digit number can be made is:

Using the digits 8637 without repetition the smallest 4-digit number can be made is:

Take two digits, say 1 and 2. Make the greatest 4-digit number using both the digits equal number of times.

Make the greatest 4-digit number using any four different digits with the condition that 5 is at ones place.

Arrange the following numbers in ascending

order: 132,2000,7500,525