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mash [69]
3 years ago
13

Ali sorced 66 and 72 marks respectively.For his two tests what is the lowest mark he must have sorced for his third test.If an a

verage sorce of a least 75 is requied to qualify for a bouns prize
Mathematics
2 answers:
vladimir2022 [97]3 years ago
6 0

Answer:

87

Step-by-step explanation:

66 + 72 + 87 = 225

225/3 = 87

Georgia [21]3 years ago
4 0

Answer:

  87

Step-by-step explanation:

For problems involving averages, it often works well to consider the differences from the average. Here, Ali desires an average of 75. The total of differences from average will be zero. The differences for the known scores are ...

  66 -75 = -9

  72 -75 = -3

The total of these is -12, so the third score must have a difference of +12 for the average to be 75

  x -75 = 12

  x = 87

For the average to be at least 75, the third score must be at least 87.

_____

You can also work this in a more conventional way. The average of the three scores must be at least 75.

  (66 +72 +x)/3 ≥ 75

  138 +x ≥ 225 . . . . . . multiply by 3, simplify

  x ≥ 87 . . . . . . . . . . subtract 138

The lowest mark Ali must receive is 87.

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andrezito [222]
A.)))))))))))


- Harvard university professor
6 0
3 years ago
eXCUSE ME!!! I NEED HELP PRONTO!! BRAINLIEST PLS! in a fraction the denominator is 4 less than the numerator. If 3 is added to b
avanturin [10]

7/5 = 14/10 = 28/20

Numerator = x

Denominator = x-4

Add 3 to both:

x +3 / (x-4+3)

x+3 = 14

(x-4 +3) = 10 = x-1 = 10

x = 11

Check:

11 -4 = 7 ( denominator is 4 less than the numerator.)

add 3 to both:

11+3 = 14

7+3 = 10

14/10 reduces to 7/5

The original fraction would be 11/7

8 0
4 years ago
How can the properties of operations be used to solve problems involving integers and rational numbers?
Alexandra [31]

Answer:

Properties of operations help a lot in solving problems related to integers and rational numbers.

<u>Step-by-step explanation:</u>

There are four properties of operations in math. These properties are applicable in case of addition and multipication but not in case of division and subtraction.

These properties are used to solve problems involving rational numbers as well as integers.These properties are associative,commutative, distributive and identity.

commutative property is A+B=B+A

                                  ⇒5+4=4+5

and                                A*B=B*A

                                  ⇒5*4=4*5

associative property ( 32+14)+7= 32+(14+7)

                                   ( 8*9)*7= 8*(9*7)

Identity property is 35+0= 35

                                    1*58=58

distributive property is 15*21

                                   ⇒  15*(20+1)

                                   ⇒15*20+15*1

                                    15*21

                                  ⇒ 15*(22-1)

                                  ⇒15*22-15*1

8 0
3 years ago
A year has 365 days, and a day has 24 hours. If an hour has 60 minutes and a minute has 60 seconds, how many seconds are there i
borishaifa [10]

Answer:

<h2>hey there!</h2>

Step-by-step explanation:

hope it is correct

The number of seconds in 365 days is 31536000 seconds in a year

<h3>hope it helped and have a nice day!</h3>

3 0
3 years ago
Which statement best represents the distance on a number line between -14 and -5
antiseptic1488 [7]
-5 - (-14)
-5 + 14 (due to same, change, change rule)
9
The distance is 9 units.
6 0
4 years ago
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