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ZX-7147D4C46E25年10月国际C卷练习 · 第 21 题
25年10月国际C卷练习 · 原库模块 2 · Q21 原库参考解析
Each 3.0-ounce serving of cheddar cheese and each 1.2-ounce serving of tuna provides about 1 microgram of vitamin B12. If a total of 3.8 micrograms of vitamin B12 are consumed from eating x ounces of cheese and y ounces of tuna, which equation best represents this situation?
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