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Algebraic word problems | Worked example

Sal Khan works through an algebraic word problem question from the Praxis Core Math test.

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• At the end of a snow storm, Elijah saw there was a lot of snow on his front lawn. The temperature increased and the snow began to melt at a steady rate. There was a depth of 18 inches of snow on the lawn when the storm ended and then it started melting at a rate of 1.5 inches per hour. Write an equation for S,S, in terms of t,t, representing the depth of snow on Elijah's lawn, in inches, tt hours after the snow stopped falling.
• could you not have combined the +128 and the -192 before subtracting and/or adding them to the other side? thank you.
• I did:
16 x 8= \$128
320-128= 192
192/24= 8
Still trying to figure out where I went wrong... 👀
• 16 x 8= \$128
320-128= 192
192/24= 8, but then this is how many hours he worked extra. You have to answer to the question how many hours long was THAT SHIFT. It will be 8+8=16
• Soooo how would I solve... A manager purchased a total of 21 coffee mugs and key chains. Each coffee mug cost \$8.50, and each key chain cost \$2.75. If the manager spent a total of \$132.50, how many coffee mugs did the manager purchase?

Im kinda confused
• Hello I Java a question?
(1 vote)
• Why did you do x-8 why 8
The 8 is gone bcz 8 multiple by 16
So all of the hours is gone so why 8
(1 vote)
• if the world is spinning why is the sky so clear?