A. 1/10
B. 1/9
C. 1/8
D. 1/7
E. 1/6

Answer: C

Explanation:
Assumed quantity of syrup = 7 litres
Current concentration:
Honey = 3/7
Flavour = 4/7

Let ‘x’ be the amount of syrup removed and replaced with honey
Concentration after removal:
Flavour = 4 – (4x/7)
Honey = 3 – (3x/7)
After adding ‘x’ litres of honey,
Flavour = 4 – (4x/7)
Honey = 3 – (3x/7) + x
Since honey and flavour must be in equal parts,
4 – (4x/7) = 3 – (3x/7) + x
Solving for x,
x = 7/8 litres
Portion of syrup replaced with honey = 7/8 * 1/7 = 1/8

Hence, the answer is option C.

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