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Solution :

a= 16(238)15

here multiple of 16 *15 = 240

240 - 2 = 238

b = 12 (178)15

here multiple of 12 * 15 = 180

180 - 2 = 178

x= 14 (?)16

HERE multiple of 14*16 = 224

224 - 2 = 222

therefore the answer is 222