Answer.

Two Mothers and Two Daughters Answer
 

Answer:

The two mothers and two daughters are only three people. There is a grandmother, a mother and a daughter.

The Grandmother and Mother make up the two mothers.

The Mother and the Daughter make up the two daughters.

Weighing Blueberries Puzzle Answer
 

Answer:

Divide the berries into three groups of three. Weight two of these groups and set the third group aside. If the one group is heavier than the other you know which group contains the heaviest berry. If both groups balance then the heaviest berry is in the third group.

Take the group with the heaviest berry and put two of the berries on the scale and set the third berry aside. If scales do not balance you know which berry is the heaviest. If the scales balance, then the third berry is the heaviest.

Berry Math Puzzle Answer.
ORDER OF OPERATIONS: Brackets, then Exponents, then Multiplication and Division in the order in which they occur, then Addition and Subtraction in the order in which they occur.
So: strawberry=5, blueberry=10, and raspberry=1
5+1×10
Multiplication is done before addition.. so 1×10=10
5+10=15

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