Answer:
volume of air = 3200 m³

Explanation:
We are given that 1 m³ of hot air can lift a mass of about 0.25 kg.
To find the volume of hot air required to lift a mass of 800 kg, we will simply use cross multiplication as follows:
1 m³ ..................> 0.25 kg
?? .....................? 800 kg

volume of hot air required = (800*1) / (0.25)
volume of hot air required = 3200 m³

Hope this helps :)

5 0

2 years ago

The populations of two towns, town A and town B, are being compared. The population of town A is 4×10^4 and the population of B

barxatty [35]

Answer:

5 times

Step-by-step explanation:

Given that,

The population of town A is 4×10⁴

The population of town B is 2×10⁵

Let the population of town is B is x times of the town A. So,

$A\times x=B\\\\x=\dfrac{B}{A}\\\\x=\dfrac{2\times 10^5}{4\times 10^4}\\\\x=5$

It means that the population of town B is 5 times of the population of town A.

3 0

2 years ago