A grocer has six suppliers with each supplier selling a different brand of tea in 4-ounce packets at $ 20 per packet. The grocer knows that one of the suppliers gives short weight, each packet of his brand weighing only 3.75 ounces.

Using a digital scale with only one weighing, what is the minimum amount the grocer must spend to be sure of finding the supplier who gives short weight?

Cut,paste and modify for 6 suppliers:

He should buy **15 packets** , 1 from supplier A, 2 from supplier B and 3 from supplier C, 4 from supplier D, 5 from supplier E

If the total weight is **60** oz, then **F** is the cheater,

If the total weight is **59.75 ** oz, then **A** is the cheater,

If the total weight is **59.50** oz, then B is the cheater,

If 59**.25** oz, then **C etc**

Total cost: **15*20=300$**

*Edited on ***November 12, 2013, 5:00 pm**