# Tata Infotech Placement: Sample Questions 8 - 9 of 41

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## Question 8

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### Write in Short

Complete the following series.

18, 20, 10, 12,4, 6, ________

### Explanation

• Divide the given series into odd and even terms series.
• Odd term series: 18,10, 4, …
• Even term series: 20,12, 6, …
• Next term will follow the same pattern as odd term series.
• Here, first and second terms of the series are 18 and 10, i.e.. Difference between them is -8.
• Second and third terms of the series are 10 and 4, i.e.. Difference between them is -6
• Same way, difference between third and fourth term of the series should be -4 (as difference gets decremented by two each time)
• So, next term will be

## Question 9

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### Write in Short

A company installed 36 machines at the beginning of the year. In March they installed 9 additional machines and then disconnected 18 in August. How many were still installed at the end of the year?

### Explanation

• In the beginning company installed 36 machines.
• In March, they installed 9 more machines and then disconnected 18 machines in August.
• We are asked to find the number of machines which were still installed at the end of year.
• Converting this statement into equation form,

• So, there are yet 27 machines installed.

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