For a demonstration, a science teacher needs a liquid alkali and a liquid acid. The diagram shows the proportional relationship between the number of beakers filled with alkali and the number of beakers filled with acid needed for the demonstration.
What is the constant of proportionality in terms of beakers of acid per beaker of alkali?
A.
6
B.
2.5
C.
3.5
D.
0.4
B. 2.5
Explanation: To find the constant of proportionality, we can use the formula beakers of acid / beakers of alkali.
From the diagram, we can see that for each beaker of alkali, we need 2.5 beakers of acid. Therefore, the constant of proportionality is 2.5.