In 30 seconds, 2-year-old Janay's heart beats 36 times.

How many times will her heartbeat in 2 minutes?

Answer: 144 times

Step-by-step explanation:

In 30 seconds, it beats 36 times

Another 30 seconds - 36 times

Another 30 seconds - 36 times

Another 30 seconds - 36 times

Therefore, in two minutes, it will beat, 36 + 36 + 36 + 36 times

Therefore, it will beat 144 times.

Another Approach

30 Seconds - 36 times

1 second - 36/30 times

Since 120 seconds make 2 minutes, then

120 seconds - 36 / 30 x 120

= 144 times

Answer: 144 beats

Step-by-step explanation