One Mach number of equal to

Define Mach number

Five-ninths of number is equal to twenty five percent of the second number . The second number is equal to one-fourth of the third number. The value of the third number is 2960. What is 30 percent of the first number .

Twice the difference between two numbers is equal to their sum. If one number is 15, find the other number.

The sum of two numbers is 2490. If 6.5% of one number is equal to 8.5% of the other,find the numbers.

The sum of two numbers is 2490. If 6.5% of one number is equal to 8.5% of the other,find the numbers.

Four different integres form an increasing AP . One of these numbers equal to the sum of sequares of the other three numbers . Find the numbers .