problem 3:
8 out of 20 means 8*5 out of 20*5 means 40 out of 100 means 40%
problem 4:
40% out of 130 means 130*40/100=52
problem 5:
11+8+9+19+3=50 so yes, the example is valid
11 out of 50 want mountain bikes that means
11*2 out of 50*2 want mountain bikes
that means 22 out of 100 wich is 22% want mountain bikes
problem 6:
you know the distribution for 50 bikes
now let's see what means 1200 bikes
1200=50*24
wich means you need to multiply each number from the table with 24
therefore
mountain is 11*24=264
touring is 8*24 = 192
comfort is 9*24= 216
juvenile is 19*24 = 456
other is 3*24= 72
