I really need help with these I can not understand!?
I need help on these math problems! 1.Three friends! dined at a restaurant. The total cost of the dinner was $ 27.00. friends decided to add 15% gratuity and then split the bill evenly, every friend how much is paid? a) $ 10.35 b) $ 9.60 c) 60 d $) 14 $ 2. On his first two tests, Billy made a 86 and 93. Billy To what extent should do about the third test to have an average of 90 for three tests? a) 91 b) 87 c) 85 d) 90 3.Paul has $ 146 in your savings account. Earn $ 36 a week mowing. If Paul saves all of its profits, after how many weeks you have saved $ 433? A) 8 weeks b) 16 weeks c) 3 weeks d) 5 weeks
(1) for the net bill after adding the point was: 27 + (15/100) 27 = 27 * (1 +15 / 100) = 27 * (1 +3 / 20) = 27 * (23/20) = 27 * 1.15 = $ 31.05 Thus each of the three friends paid 31.05 / 3 = $ 10.35 (2) average after three tests should be 90 x score Billy leave marks in the third test as average = (sum of the individual results) / Number of scores for these for 90 = (86 + x 93) / 3 cross multiplying 3 90 86 93 + 270 = x => 270 = 179 + x => x = 270-179 = 91 So Billy has to make 91 in the third round (3) mowing Paul earns $ 433 – $ 146 = $ 287 $ 146 managed to reduce this amount because it was already there on your savings (Who have not won outside mowing) earns $ 36 a week you earn $ 287 in 287 / 36 = 7.97 weeks = 8 weeks
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