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?

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

Multiply minutes in a day by 30: \(1440\times30=43200\)

Step 3: Find heartbeats in 30 days

Heart beats 72 times per minute. So total beats: \(72\times43200 = 3110400\)

Part b: In a year

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

First, minutes in a day is \(24\times60 = 1440\). Minutes in a year: \(1440\times365 = 525600\)

Step 2: Find heartbeats in a year

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

Answer:

a. \(3110400\)

b. \(37843200\) (for a non - leap year; if leap year, it would be \(72\times(1440\times366)=72\times527040 = 37946880\))