X, Y and Z can finish a work in 10, 20 and 30 days respectively. After working together for 5 days X left the work and Z also left the work 5 days before the work was complected then in how many days was the work completed?

For each day that X works he completes 1/10 of the job. So in 5 days he completes 5/10 of the job.

For each day that Y works he completes 1/20 of the job. If the job takes D days, his contributon is D/20.

For each day that Z works he completes 1/30 of the job. If he leaves 5 days before the end of the job then his total contribution is (D-5)/30.

The total of work by all three adds up to the job being complete, so the sum of these three pieces adds to 1. Then solve for D.

Find the area of each figure. Round to the nearest tenth if necessary.12hight 16 long

A car dealer will sell you a used car for $6,630 with $630 down and payments of $230.67 per month for 36 months. What is the simpl interest rate?