Question

Problem solving strategies

Questions

years = input("Enter a number of years and I'll tell you how many minutes that is ")
years = int(years)
days = years * 365
hours = days * 24
minutes = hours * 60
print(years, "years is ", minutes, "minutes")

How many trees are in the state of Washington?

How many handshakes for all the people in your class?

Answer 1

How many handshakes for all the people in your class?

2 students act it out—1 handshake

3 students — 3 handshakes

4 students — 3 + 3 = 6 handshakes

5 students — 6 + 4 = 10 handshakes

6 students — 10 + 5 = 15 handshakes

7 students — 15 + 6 = 21 handshakes

8 students — 21 + 7 = 28 handshakes

9 students — 28 + 8 = 36 handshakes

10 students — 36 + 9 = 45 handshakes

So, N students = N * (N - 1) / 2

How many trees are in the state of Washington?

Forests cover 52% of the state's land area, mostly west of the North Cascades.

Area of Washington is 184,827 km²

Hence are of forests is approx (52% of total area): 96110 km²

Let's say that tree density is 24000 trees km² (in the USA).

Then the number of trees is: 96110 km² x 24000 trees/km² = 2.306.640.000 trees