A mixture of sand, cement and ballast is in the ratio of 5:1:3.If the cost of 7 tonnes of sand is sh.3000,5 tonnes of cement sh.50000 and 8 tonnes of ballast sh 4000.Find the cost of 7 tonnes of the mixture...plz show the working​

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step-by-step explanation:

option (b) is correct

step-by-step explanation:

to find the solution of this system, we need to convert it into reduced row-echelon form. we have,

after applying row operations r2 -> r2/2 and r3 -> r3/3, we get,

the area of the rectangle is 35units^2.

step-by-step explanation:

graph it and find the distance.

it is a 5*7 rectangle.

therefore the area is 35units^2.