Question

jenny wants to determine if a new brand name washing detergent is better than her old detergent. she washes ten dirty t-shirts with the new washing detergent After washing, she thinks they are cleaner using the new detergent. what can she do to be sure the new washing detergent works better than her old detergent

Answer 1

Explanation:

to be sure she must use two different cloths of same fabric as detergents have different action on different fabric and it will better if both the clothes have stain of same substance and she can compare them by washing them for same time in two different detergents.