exam Maths Puzzle Numerical Ability

anns age is seven-tenths of bills age.in 4 years anns age will be eight-elevenths of bills age.how old is bill now?

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Jeff starts driving at 55 mph from the same point that Lauren starts driving from 70 mph. They drive in opp. Directions and Lauren has a half hour head start. How long will they be able to talk on their cell phone and have a 440 mile range. There are 2 brothers among a group of 20 persons.In how many ways can the group be arranged around a circle so that there is exactly one person between two brothers?