Lakesha gave away 8/10 of her cookies.
We know that she gave away 3/10 of her cookies to Bailey and 5/10 of her cookies to Helen.
Then the fraction that she gave away is:
3/10 + 5/10
Notice that both fractions have the same denominator, then we can directly add the numerators:
3/10 + 5/10 = 8/10
If you want to learn more about fractions:
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