Find the quotient. Write the answer in standard form. 5+41 3+61

First picture is the problem and second question is the question to the problem. Please state answer from the drop down choices.

I bought a new gas lawn mower the other day. This new mower mows faster than the old electric (environmental) one. Why, you ask? It is because the old mower cut a 21 inch path, while the new one cuts a 22 inch path. So how much time did I save? Look at some facts. My lawn is a rectangle measuring 150 feet by 105 feet I mow the lawn in strips and always in the same direction (length or width) My walking speed is 120 feet/minute It takes 5 seconds to turn around after each strip How much time did I save if I mow back and forth along the width or if I mow back and forth along the length? Pick one and figure it out. My neighbor does not like minutes the noise it makes, but I do!

Can you help me please? What is the most interesting piece of history from Greek Mathematics. Why is it interesting to you? How is it important to mathematics as a whole?

Doesn't quite answer my question...I asked if there's a way to reason the answer WITHOUT plugging in numbers, and if not, what would be the METHOD for choosing what numbers to plug in. I didn't ask to just solve the problem. Please explain. Thank you