Mathematics SAT test paper 3
Mathematics SAT Paper 1) If Alex can fold 12 napkins in x minutes, how many napkins can he fold in y hours ? A. B. C. D. Correct Answer: C Explanation: C 12 napkins in x minutes= 12/x so now the y hours convert into minutes therefore y *60 = 60y minutes (60y * 12) /x = 720y/x 2) Of all the houses in a certain neighborhood, 80% have garages. Of those houses with garages, 60% have two-car garages. If there are 56 houses with garages that are not two-car garages, how many houses are there in the neighborhood? A. 93 B. 117 C. 156 D. 175 Correct Answer: D Explanation: D 80x houses have garages. 60% of those have two-car garages, (100- 60)% = 40%=0.40 have garages that are not two-car. 80x * 0.40 = 56 x = 175 3) Let the function f be defined such that f ( x ) = x 2 -...