RRB Assistant Loco Pilot and Technician Model Paper 16 with key

Question : 38 of 75

Marks: +1, -0

Two types of alloys possess gold and silver in the ratio of 7 : 22 and 21 : 37. In what ratio should these alloys be mixed so as to have a new alloy in which gold and silver would exist in the ratio 25 : 62?

13 : 8
8 : 13
13 : 12
6 : 9

Validate

Solution:

Let the required ratio be x : 1
Quantity of gold in 1 mixture =

7/{29}

and
Quantity of gold in 2 mixture =

{21}/{58}

∴ By allegation rule
Ans. 13 : 8

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