SOLUTION: In a class,the ratio of the number of boysto the number of girls is 5:6.if there are 20 boys in the class,how many pupils are in the class

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Question 826594: In a class,the ratio of the number of boysto the number of girls is 5:6.if there are 20 boys in the class,how many pupils are in the class

Answer by MathLover1(20850) About Me  (Show Source):
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if the number of boys b to the number of girls g is 5%3A6, then we have
b+%3A+g=5%3A6
if we have b=20, then we can calculate the number of girls
20+%3A+g=5%3A6
5g=20%2A6

g=20%2A6%2F5
g=cross%2820%294%2A6%2Fcross%285%291
g=4%2A6
g=24
so, there is 24 girls in the class
all together, 20%2B24=44 pupils are in the class