#31 - Maths IQ Puzzle

Indiana Jones has stolen two solid gold bars from a treasure. But now, the village people are behind him. While running away from them, he comes across a bridge formed by a single rope. Now he knows that he can cross the bridge on that rope. But there is a signboard which reads that the rope can carry a maximum weight of 130 pounds only.

Now, the gold bar weighs 20 pounds each and he weighs 100 pounds. How will he cross the bridge now given that he can't leave the gold bar behind and he don't have enough time to return back and take them one by one ?

Maths IQ Puzzle
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If you know about the weighing systems, you must be knowing that gold is weighed in Troy system while otherwise normally, the weight is measured using the imperial system.

In Troy system, 12 ounces = 1 pound.
In imperial system, 16 ounces = 1 pound

Thus, 40 pounds of gold weighed in Troy system will be only 30 pounds in the imperial system of weighing. The weight limit for the rope must be in imperial system only as that is the standard weighing system.

Thus the total weight = 100 + 30 = 130 pounds and all he will do is simply walk it carrying both the gold bars.

#32 - Trick Situation Riddle

In a fruit store there was a unique weighing machine which was made to weigh only cherries and strawberries as they were priced the same.

Other fruits like water melons or mango had different machines as they were expensive.

A man successfully buys water melons at the price of cherries. How ?

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The logic used by the machines, It differentiated the fruits with the help of colour. So the weighing scale that would weigh only cherries and strawberries only weighed what was red. So the man peeled it and then weighed the fruit. Since it is red inside the machine weighs it and marks it at the price of cherries.