If y varies jointly with the product of x and z, and y = 105 when x = 5 and z = 7, find y when x = 9 and z = 10.
Hint
105 = k(5)(7)
Answer
y = 270
If y varies jointly with the product of x and z, and y = 1000 when x = 10 and z = 20, find y when x = 8 and z = 10.
1000 = k(10)(20)
y = 400
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