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CTET Paper I (Classes I to V) Feb 2016 Solved Paper

Question : 49 of 150

Marks: +1, -0

The product 672 × 36 × 25 equals

Solution:

Concept:

The product

672 \times 36 \times 25

can be rearranged to match the number of seconds in one week.

Explanation:

Number of seconds in 1 week =

60 \times 60 \times 24 \times 7

seconds.

This equals

3600 \times 24 \times 7

Write

3600

36 \times 100

, and

100

25 \times 4

So,

36 \times 25 \times 4 \times 24 \times 7 = 36 \times 25 \times (4 \times 24 \times 7)

Now,

4 \times 24 = 96

, and

96 \times 7 = 672

Thus, the expression becomes

36 \times 25 \times 672

, which is exactly

672 \times 36 \times 25

Therefore, the given product equals the number of seconds in one week.

Answer:

B. The number of seconds in 1 week

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