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# After 12 girls left the school assembly the ratio of the number of boys to girls is 3 to 4. if there were w boys at the assembly, write an algebraic expression for the number of girls at the beginning

After 12 girls left the school assembly the ratio of the number of boys to girls is 3 to 4. if there were w boys at the assembly, write an algebraic expression for the number of girls at the beginning of the assembly in terms of w