book Maths Puzzle Numerical Ability

At a local high school, the ratio of boys to girls is 3:4. there are 1200 boys in the school. how many girls are there?

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book Other Question
A general equation of the family of lines perpendicular to 2x-5y=7 is...

THE ANSWER IS: 5x+2y=k (BUT HOW DO U GET THIS?) please tell me how and why this is the answer

YOUR HELP IS MOST APPRECIATED, THANK YOU SO MUCH Can someone help me with this problem?

If a person jogs at a rate of 5 1/2 mi/h for 3 1/2 h. in a week, how many calories do they burn? (Calories per hours is 740)

Thanks,
Sher