Question #5d8b7

2 Answers
Mar 28, 2017

Answer:

19 boys and 13 girls

Explanation:

Rewrite the word problem as an equation:

#b+g=32#

#b+2g=45#

Use elimination. Subtract the top equation from the bottom equation:

#g=13#

Now plug into one of the equations. I will plug into the first one:

#b+13=32#

#b=19#

Mar 28, 2017

Answer:

#13# girls in the class.

Explanation:

It is possible to answer the question without using any equations or algebra at all.

The number of student is #32#.

However, with the number of girls doubled, the total is #45#.

Therefore the difference in the two totals is the number of girls, because the number of girls was added on again.

#45-32 = 13# girls in the class.

Check:

#13# girls + #19# boys = #32#

#13 +13# girls + #19# boys

#=26+19 = 45#