The correct option is D John : 7118 in ; William : 6778 in
Adam's height=7038 inches
William is 212 inches shorter than Adam.
⟹William's height =(7038−212) inches
=(8×70)+38−(2×2)+12 inches
=(5638−52) inches
=(5638−5×42×4) inches
=5638−208 inches
=(563−20)8 inches
=5438 inches
=6778 inches
John is 314 inches taller than William.
⟹John's height
=(6778+314) inches
=(67+3)+(78+14) inches
=70+(78+1×24×2) inches
=70+(78+28) inches
=70+(7+2)8 inches
=70+98 inches
=70+118 inches
=7118 inches
∴John is 7118 inches tall and William is 6778 inches tall.