<PRE><B>Question 766474</B>
let x be the number of shovels, y be the number of sanders, we know
x + y = 28
16x + 19y = 478
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solve first equation for x
x = 28 - y
substitute for x in the second equation
16 * (28 - y) + 19y = 478

448 - 16y + 19y = 478
3y = 30
y = 10 and
x + 10 = 28
x = 18
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check results with second equation
16*18 + 19^10 = 478
288 + 190 = 478
478 = 478
our answers for the number of showvels and sanders checks out   :-)
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18 shovels and 10 sanders were used
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