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Logical Reasoning :: Flow Chart

Home > Logical Reasoning > Flow Chart > Discussion

9. The purpose of the following flow chart is to double the number in each of the Boxes 2, 4,6,8 and 10.

In order to accomplish exactly this - no more and no less - What is the smallest number which may be in box 1?

throughtworks-flow-chart-logical-reasoning-question-Answers-08

Answer: Option C

Explanation :

Assume Box 2 has number 2, Box 3 has number 3 and so on.
And Box 1 has number 10
Instruction 1 : 2 [Box 2] + 2[Box 2] = 4[Box 2]
Instruction 2 : 2 [Box No.] + 2 = 4 [Box No.]
Instruction 3 : IS 10 [Box 1] < 4 [Box No.] ? NO
Instruction 1 : 4 [Box 4] + 4{Box 4] = 8[Box 4]
Instruction 2 : 4 [Box No.] + 2 = 6 [Box No.]
Instruction 3 : IS 10 [Box 1] < 6 [Box No.] ? NO
Instruction 1 : 6 [Box 6] + 6 [Box 2] = 12[Box 6]
Instruction 2 : 6 [Box No.] + 2 = 8 [Box No.]
Instruction 3 : IS 10 [Box 1] < 8 [Box No.] ? NO
Instruction 1 : 8 [Box 8] + 8 [Box 8] = 16[Box 8]
Instruction 2 : 8 [Box No.] + 2 = 10 [Box No.]
Instruction 3 : IS 10 [Box 1] < 10 [Box No.] ? NO
Instruction 1 : 10 [Box 10] + 10 [Box 10] = 20[Box 10]
Instruction 2 : 10 [Box No.] + 2 = 12 [Box No.]
Instruction 3 : IS 10 [Box 1] < 12 [Box No.] ? YES
ANSWER is 10

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