Step-by-step explanation: when Zoe was six years old, Lulu would have been 12 years old since Lulu's age is twice that of Zoe's. Since Zoe is now 10 years old, Lulu would have to be 20 years old since 10 multiplied by 2 equals 20.
Kelsey must spend less than or equal to $65. The expression 5.50b+7.5 is correct Kelsey able to purchase 10 books. On the end Kelsey can spend $2.50 to purchase small present (calendar or book for notes)
