15x2=30
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15 [lots] of 2.80 are 42.0
7 quarter hours either means 7 hours 15 minutes = 435 mins (7 hours = 28 lots of 15 minutes) (15 minutes = 1 lot of 15 minutes) (Total = 29 lots of 15 minutes) (29 x 15 = 435) or 7 lots of 15 minutes = 105 minutes (7 x 15 = 105) Pretty sure its the first one though.
The answer is... 15 !
The pair of numbers are 15 and 2, or -2 and -15 15 - 2 = 13 15 x 2 = 30 -2 - (-15) = -2 + 15 = 13 (-2)(-15) = 30
-13