X squared - x = 132, I'm too lazy to calculate,

X squared - x = 132, I'm too lazy to calculate,

X quadratic - x = 132
x^2-x-132=0
(x-12)(x+11)=0
X = 12 or x = - 11

cry for help
There are 48 tons of chemical fertilizer in the two warehouses. If 20% of the chemical fertilizer is transported out of warehouse A and 2.4 tons is transported in from warehouse B, then the quantity of chemical fertilizer in the two warehouses is exactly the same. How many tons of chemical fertilizer are there in warehouse A and warehouse B?
There are 48 tons of chemical fertilizer in warehouse B. If warehouse a transports 20% and warehouse B transports 2.4 tons, then the quantity of chemical fertilizer in the two warehouses is exactly the same. How many tons of chemical fertilizer do warehouse A and warehouse B have? (to answer, think about the process and the meaning of each step) don't have X's' ` teacher hasn't taught yet '` ask for help!

Let a have X tons and B (48-x) tons
X * (1-20%) = 48-x + 2.4 (* stands for multiplication sign)
X = 28 48-28 = 20 (ton)
A: A has 28 tons, B has 20 tons

There's a math problem I can't do. Please help me to work it out
Xiao Ming and his classmates went to climb the mountain together. They walked from the bottom of the mountain to the top of the mountain along a mountain road. It took them an hour to get to the top of the mountain, but they finished their journey in 50 minutes when they returned from the original road. It is known that the speed of going down the mountain is 1.5 times that of going up the mountain. How many kilometers per hour can they walk up and down the mountain? (it's best to use equation solution)

Time t = 13.5-9 = 4.5
Let X be the height of the mountain
x/4+x/6=4.5-1.5
We get x = 7.2
It's 2x = 14.4km up and down the mountain