A contractor combined x tons of a gravel mixture that contained 10% gravel G by weight, with y tons of a mixture that contained 2% gravel G by weight; to produce z tons of a mixture that was 5% gravel G by weight. What is the value of x? (1) y=10 (2) z=16

Statement (1) ALONE is sufficient, but statement (2) alone is not sufficient

Statement (2) ALONE is sufficient, but statement (1) alone is not sufficient

BOTH statements (1) and (2) TOGETHER are sufficient to answer the question

EACH statement ALONE is sufficient to answer the question

Statements (1) and (2) TOGETHER are NOT sufficient to answer the question