# math questions

posted by on .

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?

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

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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

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

with a test score of 99
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

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

DrWLS is right (as usual) :-)

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OK SO 1ST ONE IS 99

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

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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.

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OK I get it now
thank you

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