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Simultaneous Equations

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Why bother with a post grad? Are they even worth it? Have your say! 26-10-2016
    • Thread Starter

    PLEASE HELP! I study biomed, but I have a maths exam next week. This question came up on one of the online exams and I had no idea what to do! Now worrying the same kinda thing will come up again! Please could someone explain how to answer this:

    Barry, a zoologist, examines marine mammals in a bay that only contains harbour porpoises and humpback whales. From a survey, he determines that there are 70 fewer porpoise than whales in the bay. He also knows from past experience that the number of whales, as a proportion of the total number of whales and porpoise, in other similar waters is 0.64. He has been asked to estimate the number of humpback whales and the number of harbour porpoise in the bay.

    What is the correct estimate of the two types of marine animals in the bay?

    Hint: you solve this using simultaneous equations!

    Thank you in advance!!!!!
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