After 79 weeks the tanks will have the same amount of water.
948-7*79=395
711-4*79=395
Answer: 
Step-by-step explanation:
By the negative exponent rule, you have that:

By the exponents properties, you know that:

Therefore, you can rewrite the left side of the equation has following:

Descompose 32 and 8 into its prime factors:

Rewrite:

Then:

As the base are equal, then:

Solve for x:

Answer:
There are many scenario's.
Step-by-step explanation:
1.4:5
2.4/5
3.4÷5
Answer:
Step-by-step explanation:
s(1-30/100)=420
s(100-30)/100=420
s(70/100)=420
s(7/10)=420
7s=4200
s=600
We must divide the total height by the size of the blocks to work out how many are in the tower
22.5 / 1.5 = 15 blocks