exam Maths Puzzle Numerical Ability

what is 6(c-1)<-18

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The amount of ozone in the atmosphere is decreasing by 0.25% annually. If this rate of decrease continues, after how many years will 82.9% of today's ozone remain? I think the answ solve :

1)Seven inches are equivalent to 17.78 cm. Find the equation converting length in cm to length in inches. What is the length in inches of a 96.2 cm bar?