How many were at the rehearsal after some boys entered and some girls left? - boys entering girls viginas pictures
The proportion of children in the study was 1:2. It is now 12.19 clock, they entered 20 boys and 10 girls left.
Tuesday, February 16, 2010
Boys Entering Girls Viginas Pictures How Many Were At The Rehearsal After Some Boys Entered And Some Girls Left?
6 comments:
Number of children in the first place-x:
(x +20) / (2x - 10) = 12.19
19x + 380 = 24x - 120
500 = 5x
x = 100
Number of children in the study:
= 100 + 20 + 2 (100) - 10
= 110 + 200
= 310
Answer: 310 children
If the number of children = x
If the number of girls =
Since the ratio of boys to girls 1:2, y = 2x
Then came 20 children, so children number x 20 =
10 girls left, so the number of girls and 10 =-
However, y = 2x, so that the number of girls can also be written 2x-10
The ratio is now 12/19
Therefore
(x 20) / (2x-10) = 12.19
19x + 380 = 24x-120
5x = 500
x = 100
y = 2x = 200
Therefore, the initial number of boys = 100 is
and the original number of girls = 200
The proportion of children ie, 2b = g
Since some children arrived and some girls .. the relationship changed, 12/19
(20b) / (G-10) = 12.19 g = 2b replaced in equation
(20b) / (2b-10) = 12/19 multiply now some algebra and Cross
19 b + 380 = 24b - 120
500 = 5b
First there were boys then girls = 100 = 200
New Relationship: boys and girls = 120 = 190
2B = G (twice more girls than boys)
19 (B 20) = 12 (G-10) (the ratio of 12:19 after 20 boys and 10 girls new entries on the left)
19 (B 20) = 12 (2B-10) (equation substitution in the equation two)
19B 380 = 24B-120
5B = 500 B = 100, G = 2 (100) = 200
New was 120 boys and 190 girls, or 12:19
Number of children = x
Number of girls = 2x
(x + 20) * 19/12 = 2x - 10
19/12x + 380/12 = 2x - 10
19x + 380 = 24x - 120
380 = 5x - 120
500 = 5x
x = 100
There were 100 boys and 200 girls, for starters - ratio (1:2)
Currently there are 120 boys and 190 girls - Relationships (12:19)
2b = g
(19b) / (G-10) = 12.19
In principle, you can do the rest.
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