Question
If the average marks of the three batches 32, 45 and 54
student respectively is 50, 42 and 35, then find the approximate average mark of all the students?Solution
Required average = (32`xx` 50+45`xx` 42+54`xx` 35)/(32+45+54) = 41.06
Choose the number which is different from the group.
 How many numbers up to 800 are divisible by both 3 and 5?
15Â Â Â Â Â Â Â Â Â Â 15Â Â Â Â Â Â Â Â Â Â 60Â Â Â Â Â Â Â Â Â Â 540Â Â Â Â Â Â Â Â 8650
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