=2( 12×2.5)+2(20×2.5)+20× 12
=60+ 100+240
=400㎡
The water storage area of the pool is also the volume of this pool.
Pool volume = bottom area × height
=20× 12×2.5
=300㎡
Solution: X is the price of soap, so the price of towel is 1.5X:
4* 1.5X+5X=30.8
Equation solved: X=2.8.
A bar of soap, 2.8 yuan.