math questions

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WORD PROBLEM:
Tims tet grades in french were:
86,96,88,91
what score must Tim make on his next test to average 92?
a 89
b 93
c 97
d 99

I said 99. because when you add all
numbers its 460/5 = 92

2) the water level indicator measures the rise and fall in meters of the water level in a resevoir. The o on the gauge indicates the normal water level in the reservoir. The water level at the end of the summer was
-2 and at the end of winter it was 1.

Find the difference between the 2 levels.
-2 - 1 = -3

-3 is the difference between the 2 levels.
is that right?

  • math questions -

    1) 99 is correct
    2) I would call it a change of +3, since the water level rose going from summer to winter.

  • math questions -

    1)
    He has a total of 378 points now.

    Total possible for 5 tests is 500 points.

    0.92 * 500 = 460 needed for 92%

    460 - 378 = 82% needed on next test.

    2) The difference is 3 meters

  • math questions -

    for no 1)
    I'm confused the data is:
    86 96 88 91 which = 361

    with a test score of 99
    added in its;
    86 96 88 91 and 99 = 460 /5 = 92%

    and i don't understand how you get 3 meters
    i got -3 meters
    -2-1=
    -2 + -1 = -3

  • math questions -

    I'm sorry. I was wrong for number 1. I added the wrong group of numbers.

    DrWLS is right (as usual) :-)

  • math questions -

    OK SO 1ST ONE IS 99

    I Still don't understand how its +3 difference?
    can you explain?

  • math questions -

    It was 2 meters below normal at the end of the summer. It was 1 meter ABOVE normal at the end of winter. The water rose 3 meters in the intervening months.

  • math questions -

    OK I get it now
    thank you

  • math questions -

    Marko/Mitch -- please keep the same name on your posts.

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