Question
Lara completed 105 sit-ups in 3 minutes. She can 420 sit-ups at the same rate in ____________ minutes.
- 10
- 11
- 14
- 12
Hint:
The unitary method is a technique for solving a problem by first finding the value of a single unit, and then finding the necessary value by multiplying the single unit value.
The correct answer is: 12
Here, it is given that Lara completed 105 sit-ups in 3 minutes. We have to find the time required to do 420 sit-ups.
We have, time required to do 105 sit- ups = 3 minutes.
Time required to do 1 sit-up = 3/105 minutes.
So, time required to do 420 sit-ups = 3⁄105 × 420 = 12 minutes.
Hence, the correct option is D.
We can find the time required to 420 sit ups by multiplying the time required to 105 sit ups by 4.
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