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Question

Lily planted a sunflower and she is observing its growth. Last week the height of the sunflower was 1 m and 30 cm, and now it has grown 40 cm more. What is the current height of the sunflower in cm?
  1. 170

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Solution

The correct option is A 170
Last week, the height of the sunflower was 1 m and 30 cm.

Here, 'and' signifies addition.

Last week height =1 m+30 cm

Over the past week, the height increased by 40 cm.

Current height =1 m+30 cm+40 cm

To perform addition, let's make all the terms as like-terms.

We know, 1 m=100 cm

1 m+30 cm+40 cm=100 cm+30 cm+40 cm=(100+30+40) cm=170 cm

Hence, the current height is 170 cm.

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