Answer:
20x = 55
Step-by-step explanation:
First you have to add 3x to both sides of 11-3x=x
Now that you have 11 = 4x you divide 4 on both sides 
11/4 = x
But you can't divide 11 by 4 unless you are looking for the decimal form of 11/4 which is 2.75
so now we take 11/4 or 2.75 depending on if you need your answer in fraction or as a decimal and replace that with x however both will equal the number 55
Adam is 9 years old and Bob is 6. Twice Bob’s age is 12, three years younger than that is 9. If Adam is 9 now then in five years, Adam will be 14, which is 8 more than 6.
The probability would be 8/12
Thanks for the full problem. You did part A correctly but wrote "large shirt" instead of "red shirt" in the denominator. You correctly used 0.35, the probability of a red shirt.
The formula for conditional probability applied here says:
P( large | red ) = P(large & red) / P(red)
We have n=100 shirts, 5 of which are large and red
P(large & red) = 5/100
P(red) = 35/100
P(large | red) = (5/100)/(35/100) = 5/35 = 1/7 = 0.14285...
Part A answer: 14.3%
P(small | red) = P(small & red) / P(red) = (30/100)/(35/100)=6/7=.8571...
Part B answer: 85.7%
