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Half of the volume of petrol and kerosene mixture of ratio 7:5 is converted into a mixture of ratio 3:1 by the replacement method. While the mixture of ratio 7:5 was formed from the mixture of 7:3 by adding the kerosene in it . If 240 ltr petrol is required in the replacement method, what is the total amount of kerosene was added to prepare the mixture of 7:5 ?

1600 satellites were sent up by a country for several purposes. The purposes are classified as broadcasting (B), communication (C), surveillance (S), and others (O). A satellite can serve multiple purposes; however a satellite serving either B, or C, or S does not serve O. The following facts are known about the satellites:

1. The numbers of satellites serving B, C, and S (though may be not exclusively) are in the ratio 2:1:1.
2. The number of satellites serving all three of B, C, and S is 100.
3. The number of satellites exclusively serving C is the same as the number of satellites exclusively serving S. This number is 30% of the number of satellites exclusively serving B.
4. The number of satellites serving O is the same as the number of satellites serving both C and S but not B.

What best can be said about the number of satellites serving C?

option are

1)at least 100
2)cannot be more than 800
3)450 to 725 correct
4)