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Sum of the squares of odd number = (n(n+1)(n+2))/6 Where n = Last term = (19×20×21)/6 = 1330 type-2 Sum of the squares of odd number = (n(2n+1) (2n-1))/3 Where n = (Last term+1)/2= (19+1)/2=10 = (10×21×19)/3 = 1330
The sum of the earnings of 'D' and 'E' is Rs. 2,20,000. 'D' uses 75% of his income, while 'E' uses 65% of hers, so that 'E's savings are Rs. 17,000 more...
The radius of a circle is increased by 20%. Find the percentage increase in the area of the circle.
A shopkeeper sells two articles for Rs.3000 each. On one, he gains 25%, and on the other, he loses 20%. What is the overall percentage gain or loss?
A person spends 25% of his income on house rent, 20% of the remaining money spends on food, and 15% of theremaining money on travelling and saves Rs. 30...
Ajay spent 34% of his monthly income on rent and 48% of the remaining on food and the rest amount is saved by him which is Rs. 2574, then find the month...
In a zoo, 25% of the people are males. 40% of the remaining are females and the remaining 720 are children’s. Find the total number of people in a...
A towel was 75 cm broad and 120cm long. When bleached, it was to have lost 40% of its length and 20% breadth. The percentage of decrease in area is:
Monthly income of P is Rs.16000 and his monthly savings is Rs.10500. If his monthly income is decreased by 25% and monthly expenditure is decreased by 1...
In a test, P got 24% of total marks and failed by 35 marks while Q got 44% of total marks which is 22 more than passing marks. Find the total marks of t...
Raj saves Rs. 3000 more if he spends 65% of his income instead of 85%. Find the savings of Sanjay whose income is 20% more than that of Raj, and spends ...
