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
