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the smallest number which when divided by 10, 15, 20, 35 leaves 6,11,16,31 as remainder is...

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Average age of a class of 40 girls is reduced by 1 year when 10 girls whose average age is 20 years, are discharged and 10 new girls are admitted find the average age of new comers? if the prise of petrol increased by 25% and raj intends to spend only an additional 15% on petrol, by how much % will he reduce the quantity of petrol?