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denpristay [2]
4 years ago
13

In a group of 48 children,there are twice as many boys as girls.How many girls are there ?

Mathematics
1 answer:
zvonat [6]4 years ago
6 0
There are three groups. One group for girls. One group for half the boys which is equal to one group of girls and another identical sized group of boys because there are twice as many boys as girls.

48=total
3=number of groups

48/3=16

16 is equal to the number of girls because it is equal to half the number of boys

16*2=32

32+16=48

Number of boys plus number number of girls: 32+16=48









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Does x*x*x*x*x = 5x?<br> I'm not really sure so it would help.
hodyreva [135]

Answer:

Step-by-step explanation:

no ,x*x*x*x*x=x^5

x+x+x+x+x=5x

in multiplication those who have same base we add their power.

in addition those variables which have same base(or are like term) we add them.

6 0
3 years ago
An airplane flew with the wind for 2.5 hours and returned the same distance against the wind in 3.5 hours. If the cruising speed
KengaRu [80]

Answer:

60 miles per hour.

Step-by-step explanation:

Let r represent speed of wind blowing in miles per hour.          

We have been given that the cruising speed of the plane was a constant 360 mph in air. The speed of the plane is the direction of wind would be 360+r.

The speed of the plane is the opposite direction of wind would be 360-r.

\text{Distance}=\text{Speed}\times \text{Time}

Distance covered in the direction of wind would be 2.5(360+r).

Distance covered in the opposite direction of wind would be 3.5(360-r).

Since both distances are same, so we will get:

2.5(360+r)=3.5(360-r)

900+2.5r=1260-3.5r

900-900+2.5r+3.5r=1260-900-3.5r+3.5r

6r=360

\frac{6r}{6}=\frac{360}{6}

r=60

Therefore, the wind is blowing at a rate of 60 miles per hour.

6 0
3 years ago
How much does 60% out of 100
Salsk061 [2.6K]

Answer:

60

Step-by-step explanation:

Given: 60% out of 100

Expressed mathematically:

= (60/100) x 100

= 60

3 0
3 years ago
2/3 times what equals 54
zepelin [54]
81

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4 0
4 years ago
Can someone check my answer?
ivanzaharov [21]

The measure of EC is 1 ft.

Solution:

Given data:

AD = 8 ft, DB = 2 ft, AE = 4 ft

To find the measure of EC:

Using triangle proportionality theorem,

<em>If a line is parallel to one side of a triangle intersects the other two sides, then it divides the two side proportionally.</em>

$\frac{AD}{DB} =\frac{AE}{EC}

$\frac{8}{2} =\frac{4}{EC}

Do cross multiplication.

8EC=2\times 4

8 EC = 8

Divide by 8 on both side of the equation, we get

EC = 1

EC = 1 ft

Hence the measure of EC is 1 ft.

7 0
3 years ago
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