What is the amount of Coal exported from America? Statements: 1. America’s…

Data Sufficiency asks whether the given statement(s), alone or together, pin down ONE definite numeric value for what the question asks. A statement is sufficient on its own if the relationship it states — here, a percentage tied to a known quantity — lets you compute a single number without needing any other statement. Two statements can each be independently sufficient even though the numbers they yield need not match each other, because sufficiency is judged statement by statement, not by cross-checking consistency between statements.

Apply this to both statements in turn:

1. Statement 1 gives America's export to China (65,000 tonnes) as 8% of the total coal export. Dividing 65,000 by 8% gives one specific total export figure, computable from statement 1 alone.

2. Statement 2 directly states America's total coal export as 15% of a total of 1 million tonnes. Taking 15% of 1,000,000 gives another specific total export figure, computable from statement 2 alone.

Since each statement, read independently, already fixes its own single value for the total coal exported, neither statement needs the other to answer the question — each is complete by itself. This is exactly what qualifies a Data Sufficiency question this way: the check is whether each statement taken alone determines a number, not whether the two numbers happen to coincide.

Hence, either statement alone is sufficient to answer the question.