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Qus: Hari (H), Gita (G), Irfan (I) and Saira (S) are siblings (i.e. brothers and sisters). All were born on 1st january. The age difference between any two successive siblings (that is born one after another) is less than 3 years. Given the following facts:

Qusहरि (H), गीता (G), इरफ़ान (I) और सायरा (S) भाई-बहन (अर्थात भाई-बहन) हैं। सभी का जन्म 1 जनवरी को हुआ था। किन्हीं दो क्रमिक भाई-बहनों (जो एक के बाद एक पैदा होते हैं) के बीच आयु का अंतर 3 वर्ष से कम है। निम्नलिखित तथ्यों को देखते हुए:


A. HSIG
B. SGHI
C. IGSH
D. IHSG


Solution
B. SGHI



Explanation

 (i) H + G > I + S
(ii) |G – S| = 1
Meaning G and S will be next to each other in the order. So the option A is ruled out.
G not oldest
S not youngest
(iii) No twins
Going by the options, we will try solve the equation,
Taking as example with youngest aged 1, we can try to solve the equation, and correct the age (started with ages 4, 3, 2, 1) to suit conditions (i) and (ii) which gives 5, 4, 3, 1
S I + 4 Generalizing, w can take their ages in terms of I's age,
G I + 3 In this case, H + G > I + S
H I + 2 Since 2I + 5 > 21 + 4

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