If n is the average of three numbers x, 12, and 15, what is the value of x?

If rs 900 amounts to rs 1044 in 4 years, what sum will amount to 1368 in 3 1/2 years at the same rate

Tom drove 206 miles in 3.9 hours. estimate his average speed.

Solve for n. round to the tenths place, if necessary. 14.2 cups of flour6 loaves of bread= 20 cups of flour n