exam Maths Puzzle Numerical Ability

Two teams of workers have to do a work in 6 days.After that the first team worked 5 days,the second team joins the first one and the two teams work again 4 days together to finish

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Stu has twice as much money invested in stocks as in bonds. Stocks earned 8% interest per year and bonds 2% per year. If Stu earned a total of $400 dollars from his stocks and bonds last year how much money did he have invested in stocks? I am having trouble with this one. Anyone out there that can help me. Thanks!

The half-life of radioactive carbon-14 is 5,700 years. How much initial sample will remain after 3,000 years.

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