exam Maths Puzzle Numerical Ability

A study reported that in a random sampling of 100 women over the age of 35 showed that 8 of the women were married 2 or more times. In a group of 5,000 women based on the study results, how many would likely be married 2 or more times?

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Can someone help me on this?

I need to subtract:

7/9 - 1/6


Thanks,
Ashley Nancy jogs and walks to school every day. She does 4km/h walking and 8km/h jogging. From home to school it is 6km and it is an 1 hour trip. Using substitution how far does Nancy jog?