Question

John used kg of salt to melt the ice on his sidewalk. He then used another kg on the driveway. If he originally bought 10 kg of salt, how much does he have left? Do not include units (kg) in your answer

Answer 1

John used 1 3/4 kg of salt to melt the ice on his sidewalk.

Amount salt used to melt ice = 1 3/4

Express the mixed fraction as :

`\begin{gathered} 1(3)/(4)=(1*4+3)/(4) \\ 1(3)/(4)=(7)/(4) \end{gathered}`

He then used another 3 4/5 kg on the driveway

Express mixed frcation as :

`\begin{gathered} 3(4)/(5)=(3*5+4)/(5) \\ 3(4)/(5)=(19)/(5) \end{gathered}`

So, the amount of salt left = Total amount of salt - Amount of salt used on the driveaway + Amount of salt usde deuring drive way

From the given question :

he originally bought 10 kg of salt

Total amount of salt = 10kg

the amount of salt left = Total amount of salt - Amount of salt used on the driveaway + Amount of salt usde deuring drive way

T = 10 - 7/4 -19/5

T= 89/20

She left with 89/ 20 Unit kg weight

ANswer : 89/2-0