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3 years ago

there are 18 girls and 40 boys in the library. 5/9 of the girls are 3/8 of the boys are reading, how many children are reading

Mathematics

2 answers:

RideAnS [48]3 years ago

6 0

Answer: 25 children

Step-by-step explanation:

18 girls

Lets find what is 5/9 of girls who are reading

(18/9)*5=2*5=10 girls read

Lets find what is 3/8 of boys who are reading:

(40/8)*3=5*3=15 boys read

10 girls+15boys=25 children read

swat323 years ago

5 0

Answer:

25 children

Step-by-step explanation:

5/9 of 18 is 10

3/8 of 40 is 15

10 + 15 = 25

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Step-by-step explanation:

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3 years ago

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3 years ago

Roberta has $10,540 to invest. She plans to invest her money in certificates of deposit (CDs) that have 2.1% interest, a stock p

ira [324]

Answer:

The amount invested in CDs is $1,340

The amount invested in the stock portafolio is $6,900

The amount invested in the saving accounts is $2,300

Step-by-step explanation:

Let

x ---->the amount invested in CDs at 2.1%

y ---> the amount invested in the stock portfolio at 2.5%

z ---> the amount invested in the savings account at 1.5%

$x+y+z=10,540$ ----> equation A

$z=\frac{1}{3}y$ ----> equation B

substitute equation B in equation A

$x+y+\frac{1}{3}y=10,540$

$x+\frac{4}{3}y=10,540$

$x=10,540-\frac{4}{3}y$ ----> equation C

we know that

The total interest earned by the three amount must be equal to $231.69

$0.021x+0.025y+0.015z=231.69$ ----> equation D

substitute equation B and equation C in equation D

$0.021(10,540-\frac{4}{3}y)+0.025y+0.015(\frac{1}{3}y)=231.69$

solve for y

$221.34-0.0315y+0.025y+0.005y=231.69$

$0.0015y=231.69-221.34$

$0.0015y=10.35$

$y=\$6,900$

<em>Find the value of x</em>

$x=10,540-\frac{4}{3}(6,900)$

$x=\$1,340$

<em>Find the value of z</em>

$z=\frac{1}{3}(6,900)$

$z=\$2,300$

7 0

3 years ago

How many lines pass through two points ?

marusya05 [52]

Answer:

one

Step-by-step explanation:

4 0

3 years ago

Read 2 more answers

He price of a shampoo, cut, and style at the hairstyling salon where you work is $18.00. You generally get a 20% tip from each c

Marianna [84]

Answer:

total earning is $64.80

Step-by-step explanation:

Price of one work = $18.00

Payment by owner = 1/4 of $18.00

= 18/4

= $4.50

Earning by tip = 20% of $18.00 = 20/100 x18 = 3.60

Total earning from one work = $4.50+$3.60

= $ 8.10

Earning from 8 tips = 8x8.10

= $64.80

4 0

3 years ago