这些工程的投资共计数十亿美元。

Zhèxiē gōngchéng de tóuzī gòngjì shù shí yì měiyuán.

The investment in these projects totals several billion dollars.

五个小组的成绩共计五百分。

Wǔ gè xiǎozǔ de chéngjì gòngjì wǔbǎi fēn.

The scores of the five groups total five hundred points.

三次会议的时间共计十五小时。

Sān cì huìyì de shíjiān gòngjì shíwǔ xiǎoshí.

The total time for three meetings is fifteen hours.