Page 46 - NUMINO Challenge_D1

Basic Concepts Making Mobiles

When all products of (weight of the object) (the distance between the
center point and the object) are equal, the mobiles form a horizontal line.

Center Point

When making the mobiles, form a horizontal line between the mobiles
from the bottom, as shown below.

3
12

Example The numbers in the indicate the weight
of the objects. Find correct numbers so
that the mobiles form a horizontal line. 4

Class Notes

When all products of (weight of the object) (the distance

between the center point and the object) are equal, the 4
2
mobiles form a horizontal line at the bottom.
4
2 4 1, therefore . 3

The weight of is equal to the sum of the two weights

below; therefore, . To form a horizontal line,

3 2 implies that .

Try It Again The mobiles form a horizontal line. When
weighs 2 g, what is the weight of ?

43Words and Logic