We have 21 coins and are told that one is heavier thanany of the other coins. How many weighings on a balancewill it take to find the heaviest coin? (Hint: If the heaviestcoin is in a group of three coins, we can find it in oneweighing. Then work backward to two weighings, andso on.)
Unitary Method
The word “unitary” comes from the word “unit”, which means a single and complete entity. In this method, we find the value of a unit product from the given number of products, and then we solve for the other number of products.
Speed, Time, and Distance
Imagine you and 3 of your friends are planning to go to the playground at 6 in the evening. Your house is one mile away from the playground and one of your friends named Jim must start at 5 pm to reach the playground by walk. The other two friends are 3 miles away.
Profit and Loss
The amount earned or lost on the sale of one or more items is referred to as the profit or loss on that item.
Units and Measurements
Measurements and comparisons are the foundation of science and engineering. We, therefore, need rules that tell us how things are measured and compared. For these measurements and comparisons, we perform certain experiments, and we will need the experiments to set up the devices.
We have 21 coins and are told that one is heavier than
any of the other coins. How many weighings on a balance
will it take to find the heaviest coin? (Hint: If the heaviest
coin is in a group of three coins, we can find it in one
weighing. Then work backward to two weighings, and
so on.)
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