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Norma-Jean [14]
3 years ago
11

A package of cookies, packed , ate the fourth part at breakfast , then 3/5 at tea time. there are still 18 cookies in the pakage

...
¿how many cookies were in the package ?
Mathematics
2 answers:
Kay [80]3 years ago
7 0
Break fast =  1/4
Tea time =  3/5
Still 18 left.

Fraction left =  1 - (1/4 + 3/5) = 

1/4 + 3/5 =  (1/4)*(5/5) + (3/5)*(4/4) = 5/20 + 12/20 = (5 + 12)/ 20

 = 17/20

Fraction left =  1 - (1/4 + 3/5) =  1 - 17/20 = (20 - 17)/20 = 3/20

Fraction left = 3/20

Assuming total number of cookies in the package is x.

(3/20)x = 18

3x/20 = 18

3x = 18*20

x = 18*20/3 = 120

There were 120 cookies in the package.  
Leno4ka [110]3 years ago
5 0
Ok so
1/4 of total eaten
3/4 left
3/5 of 3/4 eaten
9/20 left
18=9/20 of whole
multiply both sides by 20
360=9 of whole
divide both sides by 9
40=whole


40 total originlly

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posledela
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What is the 22nd­ term of the arithmetic sequence ­­­ ­ ­ ­­ ­ ­ ­ ­­ 12 , 17 ,­ 22 , 27 , .... , .... , ....
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Sergeu [11.5K]

Answer:

<h2>x =  -  \frac{17}{4}</h2>

Step-by-step explanation:

6x + 3(4x - 2) = 5(2x - 8)

Expand the terms in the bracket and simplify

That's

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Using the subtraction property subtract 10x from both sides of the equation

18x - 10x - 6 = 10x - 10x - 40 \\ 8x - 6 =  - 40

<u>Add 6 to both sides of the equation</u>

8x + 6 - 6 =  - 40 + 6 \\ 8x =  - 34

<u>Divide both sides by 8</u>

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<u>Reduce the fraction with 2</u>

We have the final answer as

x =  -  \frac{17}{4}

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7 0
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