Let x be Jake's number of sold tickets. Sara's number is half as Jake's, so x/2 while, Cole's number is twice as Jake's, 2x. The equation that represents the problem is just the summation of their sold tickets. Therefore, 538= x+ x/2 + 2x, further simplifying the equation, it becomes, 538= 7/2 x. Solving for Jake's number of tickets, Sara and Cole's number of tickets can be determined.
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Answer 18 2/7
Explanation: First put the fractions in improper form 5 5/7 is 40/7 and 3 1/5 is 16/5 then multiply which equals 640/35 then divide that by 5 which equals 128/7 then do 128 divided by 7 and take the whole number which is 18, do 18 times 7 which equals 126 so final answer is 18 2/7