# Shelf puzzle


## A

328

## B

650

## Id

C16

## Job

equality

## Reason

Keep both full sides equal and describe what the box counts.

## Complete source

An imaginary equation is 900−250=□+328.

## Status

Original fictional ordinary practice; teach source/help before any own application.

## Title

Shelf puzzle

## After own work: adult practice possibility

322; 650=322+328.