Question

10% of a water tank fills every 5 minutes. If you are filling a 40 gallon tank, how many gallons will there be in 30 minutes

Answer 1

By using cross mutliplication, there are 24 gallons in the water tank after 30 minutes.

How to estimate the filling time of a water tank by cross multiplication

According to the statement the water tank is full at constant rate, 10 % tank capacity per each 5 minutes. The tank has a capacity of 40 gallons. The gained capacity is determined by the following cross multiplication, where the water capacity is directly proportional to filling time:

x ∝ t

x = (n / 100) · V × (T / t)        (1)

Where:

• n - Initial capacity percentage of the water tank, in percentage.
• V - Full capacity of the water tank, in gallons.
• T - Final time, in minutes.
• t - Initial time, in minutes.

x = [0.1 · (40 gal)] × (30 min / 5 min)

x = 24 gal

There are 24 gallons in the water tank after 30 minutes.

To learn more on cross multiplication: brainly.com/question/15209325

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