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If the ratio between pinto and black beans is 1:1, when there are 300 of one type, there has to be another 300 of the second type. Which means that there are 600 beans in total in the jar.

Answer:

600

Step-by-step explanation:

Pinto : Black = 1 : 1

When Pinto = 300, Black = 300

Total = 300 + 300 = 600