What is this question? ? (needing )

0.468 is the right answer on the first part. First you multiply without the decimal point, and then put the decimal point as the answer. And it gave us, , or therefore, the answer has three decimal places. And it gave us the answer is 0.46768 is the right answer.  4.68 is the right answer on the second part. You can also multiply without the decimal point, and then put the decimal point it's going to be the answer. And it gave us, , or therefore, the answer it has two decimal places and the answer is 4.68 is the right answer. 4680 is the right answer on the third part. First you had to multiply by the exponents, and it gave us, . Multiply by the numbers, and it gave us the answer is , or 4680 is the right answer. 46.8 is the right answer on the last part. First you had to multiply by the exponents, and it gave us, . Then you multiply by the numbers, and it gave us, , and it gave us the answer is 46.8 is the right answer. Hope this helps! And thank you for posting your question at here on , and have a great day. -Charlie

Put the ratios into fraction form. Since you do not know how many problems, replace it with an unknown number a.k.a. a variable. 

10/30 = x/60

Since you can get 30 to 60 by multiplying by 2, multiply everything on the left side by 2.

Then, you get 20/60, which means 20 = x. So, he can complete 20 minutes an hour.