Flour Selling puzzle

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You are selling White Flour and have two measuring cups.
Cup A of Flour Costs \$30,
Cup B of Flour Costs \$50

If buyer want to buy Flour costing \$70 , How will you measure?

SherlockHolmes Expert Asked on 27th September 2017 in

1. Grab two A cupfuls, put them aside.
2. Grab a third and pour it all into B.
3. Grab a fourth and pour into B as much as it can hold.
4. Put the remaining flour inside A aside and you now have \$70 worth.
GReaperEx Curious Answered on 28th September 2017.

Fill a cup of 50\$ full, keeping 30\$ cup empty. Now put flour from 50\$ cup to 30\$ cup till 30\$ cup gets full. PAck this for the user, and again fill the 50\$ cup and pack. You have given him flour worth 70\$

ekta27 Curious Answered on 30th September 2017.

Solution provided by Ekta27 has a slight error* (indicated below) but is the easier one (less number of steps) compared to the answer marked ‘Best’:

Splitting the process into individual steps:

1. Fill Cup A.
2. Keep aside. (For customer)
3. Fill Cup A again.
3. Keep aside (For customer)
4. Fill A again
5. Pour into B
6. Fill A again
7. Pour into B till B is full.
8. Pour remaining flour from A for customer.

1. Fill cup B.
2. Pour from cup B into cup A till A is full.
(* The sentence “Pack this for customer” after step 2 seems to imply that the qty filled in ‘A’ is to be packed, which is wrong.)
3. Keep aside (For customer)
4. Fill Cup B again.
5. Pack the contents of B for customer (along with the qty kept aside in step 3)

Viji_Pinarayi Expert Answered on 17th October 2017.

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