Question

Jill sold half of her comic books and then bought sixteen more. She now has 36. With how many did she begin? Write the algebraic equation form please!
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Answer 1

40 comic books.
Explanation:
Let's say she started with x comic books:
she sold
1
2
of them:
x
2
then she bought 16 more:
x
2
+
16
now she has 36 comics:
x
2
+
16
=
36
solve...
x
2
=
20
x
=
40