We know that a2 - b2 = (a+b)(a-b) (108.999)² - (102.001)² = (109)² - (102)² =(109+102) (109-102)= 211 x 7= 1477
The average cost price of articles 'P' and 'Q' together is Rs. 280, where the cost price of article 'Q' is Rs. 40 more than that ...
Average of four consecutive prime numbers R1, R2, R3, and R4 is (14 + x). If the average of R1 and R2 is (11 + x) and the average of R3 and R4 is (11 + ...
Average of 20 numbers is 90. Average of first 8 numbers is 103 while average of last nine numbers is 40. If ninth number is 25% less than the tenth numb...
The average weight of five friends A, B, C, D and E is (x+8) years while the average weight of C and E is (x-8) kg. If the weight of another person F is...
The average of five consecutive natural numbers is 14. What will be the average of the seven numbers if the next two natural numbers are also included?
The average age of 10 men is increased by 2 years when two of them whose age are 24 and 26 years replaced by two new men. The average age of the two ne...
In a group of 50 students, the average monthly tuition is Rs. 7,200. Following a fee adjustment, the new average monthly tuition per student is Rs. (720...
The average of 7 numbers is 28. The average of first three of them is 23 and the last three of them is 42. Then the fourth number is:
A and B started a business investing Rs. 1200 for ‘x’ months and Rs. 1800 for 16 months, respectively. Out of total profit of Rs. 3500, pro...
In a group of 3 numbers, the 1st is double of 2nd and half of third. If the average of the three numbers is 56 then find the difference between t...
