For a geology project, Chelsea collected 16.5 kg of rocks on the first expedition and 14.7 kg on the second expedition. Ari collected the same total kilograms of rocks as Chelsea did, but he collected only 13.9 kg on the first expedition.


How much did Ari collect on the second expedition?

A.
31.2 kg

B.
14.7 kg

C.
17.3 kg

D.
2.6 kg

16.5 + 14.7 = 31.2

31.2 - 13.9 = ________ kg

To find out how much Ari collected on the second expedition, we need to calculate the total amount of rocks Chelsea collected and then subtract what Ari collected on the first expedition.

Chelsea collected 16.5 kg on the first expedition and 14.7 kg on the second expedition, making her total 16.5 + 14.7 = 31.2 kg.

Since Ari collected the same total kilograms of rocks as Chelsea, his total must also be 31.2 kg.

We know that Ari collected 13.9 kg on the first expedition, so we can subtract this from the total to find out how much he collected on the second expedition.

31.2 - 13.9 = 17.3 kg

Therefore, the correct answer is C. 17.3 kg.