exam Maths Puzzle Numerical Ability

Five 7th grade friends are standing in line to pick up their lunch. Laura is the 20th person behind Rayma. Rayma is the 50th person ahead of Deanna. Deanna is the 10th person behin

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find the value of k so that the equations 16x-ky=8 and 4x-4y=7 will have a dependent system Criticize the following claims, which were cited in the New York Times of September 25, 1987 and October 21, 1987:

a new dental rinse "reduces plaque on teeth by over 300%"

A