Question

★★★ 6. on the average your heart beats about 72 times per minute. at this rate, about how many times will it beat:
a. in a 30 - day month?
b. in a year?
c. in your lifetime, if you live to 72 years of age?

Explanation:

Part a: In a 30 - day month

Step 1: Find minutes in a day

There are 24 hours in a day and 60 minutes in an hour. So minutes in a day: \(24\times60 = 1440\)

Step 2: Find minutes in 30 days

Minutes in 30 days: \(1440\times30=43200\)

Step 3: Find heartbeats in 30 days

Heart beats 72 times per minute. So total beats in 30 days: \(72\times43200 = 3110400\) (matches the given answer)

Part b: In a year

Step 1: Find minutes in a year (assuming non - leap year, 365 days)

Minutes in a day: \(24\times60 = 1440\)
Minutes in a year: \(1440\times365=525600\)

Step 2: Find heartbeats in a year

Heart beats 72 times per minute. So total beats in a year: \(72\times525600=37843200\)

Part c: In a lifetime (72 years)

Step 1: Find heartbeats in one year (from part b: 37843200)

Step 2: Find heartbeats in 72 years

Total beats in 72 years: \(37843200\times72 = 2724710400\)

Answer:

a. \(3110400\)

b. \(37843200\)

c. \(2724710400\)