The legal age to cast a vote in Singapore is $21$ years old and above. Aliff is $5$ years younge

Question

The legal age to cast a vote in Singapore is $21$ years old and above.
Aliff is $5$ years younger than twice of Jane's age.
The sum of their age is at most $43$.
Jane claims she can vote in four years' time.
By letting $x$ years old be Jane's current age, form an inequality and justify if Jane is correct.[4]

Accepted Answer

$x+(2x-5)\le43\Rightarrow x\le16$. Jane is at most 20 in four years, so her claim is false.

Linear Equations and Inequalities - Problem Solving Involving Inequalities

Linear Equations and Inequalities - Problem Solving Involving Inequalities

Solution:

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