My teacher bought 20books from sale , she spent total $110 , some books are of $3 & some are of $8 , howmany books are of $8 if the no. of books price $3 is x

Please solve it for me this from topic "Constructing Equations in Algebra To Solve Problems

Iam x years old & 3times my age 4 years ago is 27 years , how old Iam . Please solve it for me

this question is based on the topic " Constructing Equations in Algebra To Solve Questions "

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