There were 28 white ducks swimming in a pond.
• twice as many brown ducks flew in and landed in the pond.
• then half of the white ducks flew away.
how many ducks remained in the pond?

28 white ducks swimming in pond
2*(28 white ducks) = 56 brown ducks flew and landed in pond
(28 white ducks)/2 = 14 white ducks remained in the pond

Ducks remaining in the pond (at this point):
(14 white ducks) + (56 brown ducks) = 70 ducks in all

Set square i think so

The first digit is in the middle school 100s place