252 x 30 = 7560
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252 + x = 500 x = 500 - 252 x = 248
90
Because 252 is a multiple of 12, 12 and 252 are one pair (252 = 12 x 21 = 252 x 1)Another pair is 36 and 84 (252 = 36 x7 and 84 x 3)252 = 3 x 3 x 4 x 7 = 12 x 3 x 7, so only 36 and 84 are possible multiples of 12.
There are 60 minutes in one hour. Therefore, 3 hours 30 minutes is equal to (3 x 60) + 30 = 210 minutes.
0.6 x 420 = 252