In prima, secunda and tertia

The numbers of children in Class 1, Class 2, and Class 3 are in the ratio 3:4:3. Class 1 and Class 3 together have 12 more children than Class 2. How many children are in Class 1?

Final Answer:

a =  18

Step-by-step explanation:

a:b:c=3:4:3 = 3x:4x:3x 3x=3x => a=c  a+c = 12+b  3x+3x=12+4x  3 x+3 x=12+4 x  2x=12  x=212=6  x=6  a=3 x=3 6=18 b=4 x=4 6=24 c=3 x=3 6=18



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