exam Maths Puzzle Numerical Ability

Please helpe me solve this math problem:

Cheryl is thirteen years more than twice as old as Brad. In 11 years the sum of thire ages will be 92. How old is Cheryl now?

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exam Other Question

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 Find all real or imaginary solutions to the eqyation.
3v^2+4v-1=0