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[tex] \huge \boxed{\mathbb{QUESTION} \downarrow}[/tex]
[tex] \huge \boxed{\mathfrak{Answer} \downarrow}[/tex]
Let's take Yasmine's age as 'k'.
(1) Given that, Yasmine's mom = 4 times as old as Yasmine = 4k (keyword ⇨ times = multiplication)
So, Yasmine's mom = 4 × k
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(2) Given that, Yasmine's sister = 10 years older than Yasmine = 10 + k (keyword ⇨ older than = addition)
So, Yasmine's sister = 10 + k