Out of 4 numbers, the average of first 3 is 19 and last 3 is 20. If the last number is 21. Find the first number?
Sum of first three numbers = 19 × 3 = 57 Given that last number is = 21 ∴ sum of all the four numbers = 57 + 21 = 78 ..(i) Sum of last 3 digits = 20 × 3 = 60..(ii) By subtracting (ii) from (i), we will get the first number, the first number, First number = (i) – (ii) = 78 – 60 = 18
What is the simplified form of the expression?
(1 + x) (1 + x²) (1 + x⁴) (1 + x⁸) (1 – x)?
A.(1-x40)
B.(1-x1...
If (5x + 2)3 + (x – 1)3 + 8(3x – 7)3 = 6(5x + 2) × (x – 1) × (3x – 7), then the value of (5x + 3) is
...
when x =5 and y =-7 then find the value of 27x³ +58x²y +31xy² +8y³?
If x = 19, then the value of x5 - 20x4 + 20x3 - 20x2 + 20x - 1 is
In a club of singers and dancers, 10% of the artists are absent on a particular day and 90% of the present artists are dancers. If 2,250 singers are pr...
In a class of 70 students and 25 teachers, each student got gifts that were 20% of total number of students and each teacher got gifts that were 10% of ...
If x −y =4and xy =45,thenthevalueof x 3 −y3is:
In △ ABC, ∠ A = 90°. M is the midpoint of BC and D is a point on BC such that AD Ʇ BC. If AB = 7 cm and AC = 24 cm. then AD: AM is equal t...
