Question

A garrison has sufficient provision for 480 men for 12 days . if then of men is reduced by 160 , find how long will they provision last

Answer 1

This is a problem that can be solved using unitary method.
The amount of provisions and number of men are inversely related.
The answer is,( 12×480)÷160=36.

Answer 2

men     days                                                                                                          480     12                                                                                                         480-160   ?(cross multiply)                                                                                                   320*12/480=8days