 
 <prompt> A pipe is clogged so that only 2 ounces of cleaner can run through the pipe per minute. After fifteen minutes, the cleaner has unclogged it enough that 3 ounces can run through per minute. Ten minutes later, the clog is cleared enough for 4 ounces to run through per minute. How many ounces of cleaner were used after 30 minutes? 

Furen ciki ya kasance cikin hanyan, domin haka kawai 2 ounces na cleaner zai iya kama a cikin minti. Bayan minti goma ashirin, furen ya kama ya kasance cikin minti goma biyu. Minti goma ashirin bayan haka, furen ya kama ya kasance cikin minti goma uku. Me ya faru idan aka amfani da ounces 30 bayan minti? <response>: For 15 minutes at 2 ounces per minute, 2 * 15 = 30 ounces were used.
For the next 10 minutes at 3 ounces per minute, 3 * 10 = 30 ounces were used.
There are 30 - 15 - 10 = 5 minutes remaining.
For the next 5 minutes at 4 ounces per minute, 4 * 5 = 20 ounces were used.
After 30 minutes, 30 + 30 + 20 = 80 ounces of cleaner were used.

The answer will be 80. 