Thursday

March 5, 2015

March 5, 2015

Posted by **srihita** on Monday, March 26, 2012 at 10:23am.

1) How many boys were in the hall at first?

2)Ho many more boys than girls were in hte hall at first?

- maths -
**A.P.**, Monday, March 26, 2012 at 10:55amYou can set the number of boys to be x and the number of girls to be y.

After a third of the boys leave, you are left with 2/3x. 22 new girls arrive, so you get y+22

Now, you have a system of equations:

x+y = 256

2x/3 = y+22

Express y in terms of x in second equation:

y= 2x/3 -22

Set 2x/3 -22 into the first equation in stead of y.

(2x/3)-22+x = 258

5x/3 = 280

x=168

That means that y = 258-168 = 90

Controll: 90+22=112; 168*2/3=112;

**Answer this Question**

**Related Questions**

Maths - There are 175 pupils in a hall. 40% of them are boys. 25 girls enter the...

Maths - There were some boys and girls in the school hall at first. 40% of the ...

Maths - A moment ago, 80% of the children in a hall were girls. 48 girls and 2 ...

math - There are only Chinese and Malay pupils in a hall.The ratio of the number...

maths P5 - There were 335 children in a hall. 1/4 of the girls and 2/5 of the ...

maths - There were 335 children in a hall. 1/4 of the girls and 2/5 of the boys ...

MATHS - The ratio of the number of adults to the number of children in an event ...

maths - The ratio of the number of adults to the number of children in an event ...

maths - THE AREA OF 4 WALLS OF A HALL IS 3.20MSq the length and breabth of hall ...

Algebra - To rent a certain banquet hall, there is a reservation fee of $4200.00...