Lighting the home depot recently sold 8.5-watt led bulbs for $ 3.97 each and 18-watt led bulbs for $8.97 each. if river memorial hospital purchased 200 suck bulbs for a total of $1494, how many of each type did they purchase?

Step-by-step explanation:

let number of 8.5 -watt bulbs=x

and number of 18 -watt bulbs=y

x+y=200

x=200-y

3.97 x+8.97 y=1494

3.97(200-y)+8.97 y=1494

794-3.97 y+8.97 y=1494

5y=1494-794=700

y=140

x=200-140=60

number of 8.5- watt bulbs=60

and number of 18-watt bulbs=140

6 hours 48 min

step-by-step explanation:

68÷5=13.6

13.6×30=408min=6 hours 48 min.

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the solution, from the graphing of the two lines, is (3,2), i.e., x = 3, y = 2.