mistyreisorow1ul2 mistyreisorow1ul2

10-09-2017
Mathematics

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There are 7 more girls than boys in a class. There are 23 students in the class in all. How many girls are there in th class. What are the unknowns in this problem

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texaschic101 texaschic101

10-09-2017

The unknowns : number of boys (b) and number of girls (g)

b + g = 23
g = b + 7

b + b + 7 = 23
2b + 7 = 23
2b = 23 - 7
2b = 16
b = 16/2
b = 8 <=== there are 8 boys

g = b + 7
g = 8 + 7
g = 15 <=== there are 15 girls

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