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Earlier discussion
2 older comments kept for context.
bolu jiga
Total age of whole family = 21 × 14 = 294
total age without grandfather = 20 × 12 = 240
therefore age of grandfather = 294 - 240
= 54 years old
Oluwaseun Adeyemi
Total age of the whole family = 21 x 14 = 294
Total age without the grandfather = 21 x 12 = 252
Age of grandfather = 294 - 252
= 42 years