Question

Rina is $x$ years old. Her sister Bina is $5$ years older than her. If their ages add up to $15$, then Bina's age is

• A. a multiple of $5$
• B. a multiple of $6$
• C. a multiple of $7$
• D. divisible by $8$

Answer 1

Answer: (A)

a multiple of $5$

Age of Rina $=x$
Age of Bina $=(x+5)$
Sum of their ages $=x+x+5$

According to the statement:
$2x+5=15$
$2x=10$
$x=5$

Hence, option A is correct.