The ratio of boys to girls in class a is 3 to 4. the ratio of boys to girls in class b is 4 to 5. if the two classes were combined, the ratio of boys to girls in the combined class would be 17 to 22. if class a has one more boy and two more girls than class b, how many girls are in class a?

Step-by-step explanation:

Let B be number of boys present in Class A

Let G be number of girls present in Class B

B/G= 3/4 ---> 4B-3G=0    (1)

For class B

B-1 / G-2 =4/5

5(B-1)=4(G-2)

5B -4G=-3                        (2)

Solving equation 1 and 2

20B -15G=0

20B-16G=-12

G=12

Number of girls in class A is 12

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