Well, I could trace the pattern a bit. Look, 7-3 = 124 i.e., 7-3 = 4 and 4*3 = 12 6+3 = 279  i.e., 6+3 = 9 and 9*3 = 27  Going by this, 15-3 = 12 and 12*3 = 36 Hence the answer is 15-3 = 3612. :)

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Length , Mass and Time are the three Chief Fundamental Quantities. However in the S.I. System there are 7 Accepted fundamental Quantities:1. Length  (metre)2. Mass (Kg)3. Time (Seconds)4.  Electric Current (Ampere)5. Temperature (Kelvin)6. Luminous Intensity (Candela)7. Amount of Substance (mole)

Living things exhibit movement for several reasons, namely:1. For procuring food and Safe Shelter2. For Reproduction3. For Suitable environment to thrive Best.

Scalar Quantities can simply be added by normal arithmetical Rules.For Example: Suppose we have to add 5m and 10m (metre i.e, is a Scalar Quantity), then (5+10)m=15mIn the Case of Vector Quantities we may have to interpret with triangular law and different other methods