Answer:
let Alice seashells be X and Chloe's be Y
x + Y = 308.........i
3(X - 56) = Y.......... ii
simultaneous equation created
{X + Y = 308}
{3X - 168 = Y}
X + Y = 308
3X - Y = 168........by elimination method
4X + 0 = 476
X = 119
therefore.... Alice had 119 seashells at first
from eqn(i)...
X + Y = 308
119 + Y = 308
Y = 308 - 119
Y = 189
therefore.... Chloe had 189 seashells at first
