I am on a holiday in Dolbania. Five different denominations of coin are in circulation here. I know they are worth five cents $.10 $.25 $.50 and one dollar. But I don’t know which is which and the values are not marked on them one of the coins has a star on it one has a tree one has a cat one has a bird and one has a fish. I visit the same café every morning. Normally I buy a cup of coffee and a slice of carrot cake. The cost is $3.20 and I pay with a five dollar note on the first morning I received three fish coins and three cat coins as change. On the second morning my change was five fish coins five bird coins and one star coin. A) what is the value of the “cat” coin? B) Today I ordered the usual cup of coffee but instead with two slices on carrot cake, I paid in five dollar note once again and my change was a single cat coin. How much does the cup of coffee cost?

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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.