Answer :

charstar
a) 81 and 48 have a common factor of 3:
81w+48= 3(27w+16)

b) 10 and 25 have a common factor of 5:
10-25t=5(2-5t)

c) 12, 16 and 8 have common factors of 4:
12a+16b+8=4(3a+4b+2)

Hope this helps :)

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