The ratio of hard problems to easy Problems was 23 to 7. How many easy problems were there if the total number of problems was 930?

When using the linear combination metho e linear combination method to solve a system of linear equations, the four options are:

Write the equation in logarithmic form m^x=n

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document