Question

Given that a, b and c are three consecutive multiples of 5, where $a,b,c>0$. Choose the correct option(s).

• A. b = a + 5
• B. a + b + c = 15
• C. c = b + 5
• D. a = c - 10

Answer 1

Answer: (A), (C), (D)

a = c - 10

Let a, b and c be the three consecutive multiples of 5.
The consecutive multiples of '5' differ by 5.
So, b = a + 5,
and c = b + 5
$\Rightarrow$ c = a + 5 + 5
$\Rightarrow$ c = a + 10
$\Rightarrow$ a = c - 10
$\therefore$ a + b + c = a + a + 5 + a + 10 = 3a + 15 $\ne$ 15