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3 years ago

How to do this question plz

Mathematics

1 answer:

MrRissso [65]3 years ago

8 0

Answer:

10:1

90 red counters

30 blue

1/3 of 90 =30

80% of 30 =24

90-30 =60 remaining red counters

30-24 =6 remaining blue counters

= 60:6 simplest form is 10:1

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Kevin will take 4 math tests this term. All of the tests are worth the same number of points. After taking the first 3 tests, hi

Makovka662 [10]

Answer:

Kevin needs 96 points on his last test to raise his mean test score to 90 points.

Step-by-step explanation:

we know that

The mean score is the total of all scores divided by the total number of tests.

Let

x_1 ----> the score in the first math test

x_2 ----> the score in the second math test

x_3 ----> the score in the third math test

x_4 ----> the score in the fourth math test

we have

After taking the first 3 tests, his mean test score is 88 points

$\frac{x_1+x_2+x_3}{3} =88$

$x_1+x_2+x_3=264$ ----> equation A

How many points does he need on his last test to raise his mean test score to 90 points?

$\frac{x_1+x_2+x_3+x_4}{4} =90$

$x_1+x_2+x_3+x_4=360$ ----> equation B

substitute equation A in equation B

$264 + x_4 = 360$

solve for x_4

$x_4 = 360-264$

$x_4 = 96$

Therefore

Kevin needs 96 points on his last test to raise his mean test score to 90 points.

4 0

3 years ago

A scale drawing of a rectangular prism is 10cm by 8.5 cm. If the actual field has dimension of 40m by 34m, what scale can be use

Bad White [126]

The answer will be D. Hope it help!

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3 years ago

Alma en peso ajugar ala ora que marca el reloj qué eran las 3 :45pm y terminó alas 5pm cuánto tiempo Jugo alma Alma empezó a jug

anzhelika [568]

Answer:

01:55:55

Step-by-step explanation:

1 horas 55 minutos 55 segundos

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4 years ago

Benny bought six new baseball trading cards to add to his collection . The next day his dog ate half of his collection. There ar

KIM [24]

90 because if his dog ate half his cards and benny had 45 left that means 45 times two equals 90 because the dog ate HALF of 90

3 0

3 years ago

I Need Some Help!!!!!!!!!

ehidna [41]

Answer:

median = 50

difference in the quartiles = 45

Step-by-step explanation:

The median amount is the line in the middle of the box

The median is 50

The difference between the upper quartile and the lower quartile is the difference between the right end of the box and the left end of the box

65-20 = 45

4 0

3 years ago

How to do this question plz ​

How to do this question plz