If (a minus b) : (b minus c) : (c minus d) is 1 : 2 : 3, then what is the value of (a plus d) : c?

A1:2

B2:1 ✓ Correct

C4:1

D3:1

Correct answer: (B) 2:1

Explanation

(a + d) : c equals 2 : 1.

Take a - b = 1, b - c = 2, c - d = 3 and set d = 0.

Then c = 3, b = 5, a = 6.

a + d = 6 + 0 = 6 and c = 3.

(a + d) : c = 6 : 3 = 2 : 1.

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