Book Maths Puzzle Numerical Ability Probability

You have a bird seed,a duck, and a fox that need to cross a river. You can only take one item/animal at a time in the boat. The duck will eat the birdseed if left alone. The fox will eat the duck if left alone. On the other side of the river are birds that will eat the birdseed if left alone. How do you get the birdseed duck and the fox all across the river

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Book Other Question

16 men can complete a work in 15 days . 24 children can do same work in 20 days . in how many days will eight men and 8 children together complete the work ? One side of a rectangle lies along the line 4x+7y+5=0.
Two of its vertices are (-3,1) and (1,1). Which of the foolowing is not an equation of the other three straight lines?
a)14x-8y=6
b)7x-4y=-25
c)4x+7y=11
d)14x-8y=20