At the beginning of 2019, January 1, three siblings Joan, Stonewall and Georgina were given an amount of GHS 5000 to be shared and invested in an interest bearing account. Joan was given an amount x, with which she was able to negotiate an interest of 5% per annum. Stonewall was, also, given an amount y, which he invested in an account that pays an interest of 10% per annum. Georgina, on the other hand, was given an amount z, which she invested in an account that eamed her an interest of 8% per annum on her investment. At the end of the year, the three siblings were able to eam a total interest of GHS 345. In addition, the amount of given to Georgina is GHS 420 more than the amount invested by her two siblings combined. (i) Write down the three linear equations and represent them in the matrix form AX = B. (ii) Find the amount of money given to each of the 3 siblings using matrix inversion

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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.