I'm assuming you want us to solve for the unknown variable z

Combine like terms on the right side

Use the distributive property on the left side

Add both sides by 20 to cancel out the "-20" on the left side

Divide both sides by 10

That is the value of the known variable, z, in this equation. Let me know if you need any clarifications, thanks!
~ Padoru
Answer:
Search to find the detailed rainfall collections if you want more detailed rainfall intensity data. If all available is monthly average in mm, take the monthly average and divide by number of hours in that month. So if you had 300 mm in April, take 360 mm/(30 days * 24 hours) = 0.5 mm/hour average monthly intensity. so that's it
Answer:
167 and 168
you divide 335 by 2, you get 167.5
so it's gonna be either 166 and 167 or 167 and 168
then you add up 166 and 167, you get 333 (so this is not the answer)
it means the answer is <u>1</u><u>6</u><u>7</u><u> </u><u>a</u><u>n</u><u>d</u><u> </u><u>1</u><u>6</u><u>8</u> (167+168=335)
hope it helped, sorry for my bad english
if something is not clear, write a comment I'll answer