Question

My barometer is reading 1253 torr. What is the pressure in mmHg?

A. 1.253
B. 1.649
C. 1253
D. 1649

Answer 1

The pressure in mmHg is 1253 (option C)

Step-by-step explanation:

Two quantities are directly proportional if when multiplying or dividing one of them by a number, the other is multiplied or divided by that number. In other words, the magnitudes are directly proportional when one magnitude increases and so does the other in the same proportion; or when one magnitude decreases and so does the other in the same proportion.

The rule of three or is a way of solving proportionality problems between three known values ​​and an unknown value, which can be applied to directly proportional quantities as follows:

a ⇒ b

c ⇒ x

So
`x=(c*b)/(a)`

where a, b and c are data and x is the unknown value to be calculated.

In this case, knowing that 1 Torr = 1 mmHg, the rule of three can be applied as follows: if 1 torr is equal to 1 mmHg, 1253 torr is equal to how many mmHg?

`pressure=(1253 torr*1 mmHg)/(1 torr)`

pressure= 1253 mmHg

The pressure in mmHg is 1253 (option C)