Latest TCS Aptitude Question SOLUTION: 2 gears. one with 12 teeth and the other one with 14 teeth are engaged with each other. One tooth in smaller gear and one tooth in bigger gear are marked and initially those 2 mark

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(#M40033519) TCS Numerical Ability question Keep an EYE

2 gears. one with 12 teeth and the other one with 14 teeth are engaged with each other. One tooth in smaller gear and one tooth in bigger gear are marked and initially those 2 marked teeth are in contact with each other. After how many rotations of the smaller gear with the marked teeth in the other gear will again come into contact for the first time?
a. 7
b. 12
c. Data Insufficient
d. 84

Asked In TCS akshitha (10 years ago)

Unsolved Read Solution (6)

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Read Solution (6) :

saiharsha  (10 years ago)

Assume the distance between the teeth is 1 cm. Then the circumference of first gear is 12 cm and the second is 14 cm.
Now LCM (12, 14) = 84.
So to cover 84 cm, the first gear has to rotate 84/12 = 7 rounds
(the second gear rotates 84 / 14 = 6 rounds as it is bigger)

Is this solution Helpfull? Yes (35) | No   

Koustav Ghosh  (10 years ago)

The number of rotations of the two wheels will be inversely proportional to the number of teeth the wheel has. Since the ratio of the number of teeth is 6 : 7, the ratio of the number of rotations of the wheels is 7 : 6. The two marked teeth will be together only after both the wheels have done an integral number of rounds. Thus, smaller wheel will have done 7 rounds.

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Pooja Chourey  (10 years ago)

84
take the LCM of 12 and 14

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amit vijayvargiya  (9 years ago)

lcm of 12 and 14 is 84;
84/12=7
answer is 7

Is this solution Helpfull? Yes (2) | No (1)  

sanju  (10 years ago)

plzzz provid crct sltn

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pratap  (10 years ago)

distance b/w the teeth is not given so the data is insufficient.

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