There's a forest behind a town. To improve the air quality, the people of the town started a tree planting initiative and planted 65 trees everyday. How many trees will they have planted after 3 weeks?
A
65
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B
1300
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C
1365
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Solution
The correct option is C1365 Trees planted in 1 day =65 trees
We need to find the number of trees planted after 3 weeks.
How many days are there in 3 weeks? 1 week =7 days 3 weeks =7×3 days =21 days
Trees planted after 3 weeks (i.e. 21 days) =65×21 trees
The product 21×65 can be evaluated as:
First, we would multiply the units digit of 21, i.e., 1 with 65.
Now, we would multiply the tens digit of 21, i.e., 2 with 65.
Finally, we would add 65 and 1300 to get the answer.
21×65 trees =1365 trees
Number of trees planted in 3 weeks =1365 trees