O_er_t_o_

Complete the missing letters of the given word.

What work can one never finish?

Can you fill the blank with the correct number?

6 30 870 756030 _____

John was working on a Chemical Mixture whose weight comprise 90% liquid and 10% solid. The total weight of the mixture is 20 pounds. After a while, John noticed that some of the liquid evaporated and now the liquid comprises just 50% of the weight.

What is the weight of the chemical mixture now?

A clock loses 10 minutes each hour. If the clock is set correctly at noon, what time is it when it reads 3 PM?

Using the clues below, what four numbers am I thinking of?

The sum of all the numbers is 31.
One number is odd.
The highest number minus the lowest number is 7.
If you subtract the middle two numbers, it equals two.
There are no duplicate numbers.

How many cubic feet of dirt are in a hole of one foot deep, three feet long, and two feet wide?

It is raining today at 11:59 am. What is the probability of sunny weather after 72 hours?

An express train takes 3 seconds to enter the tunnel which is 1 km long.
If it is travelling at 120 km an hour, how long will it take to pass completely through the tunnel?

Can anyone tell me a word in the English dictionary which has a silent 'z'?