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A student scored 70%,80%,50% and 48% in ...

A student scored `70%,80%,50% and 48%` in four papers. It was decided to give double weight age to the 1st and the 3rd paper and half to the 2nd and 4th paper. By what % does it change from the average before the decision was taken?

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The correct Answer is:
`-1.2%`
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In a class, there are 54 students. 33(1)/(3)% of the number of students are boys and rest are girls. The average score in mathematics of boys is 50% more than that of the girls. If the average score of all the students is 70, then what is the average score of the boys?