Question
The arithmetic mean and geometric mean of two numbers
are 7 and 2√10 respectively, then find the numbers.Solution
Arithmetic Mean = 7  (x + y)/2 = 7 x + y = 14                           ----(1) Geometric Mean = 2√10 √ xy = 2√ 10 Now, xy = (2√ 10)2 = 40 ------(2) (x - y) ² = (x + y) ² - 4xy  (x - y) ² = 142 - (4 x 40)  (x - y) ² = 196 - 160 = 36 x - y = 6             ----(3) Now, adding equation (1) and (3) we get  2x = 20  x = 10 and y =4. (10,4)
 √256 * 4 – 30% of 190 + ? = 110% of 220
20% of 450 - 15% of 400 = 25% of ?
6612 ÷ 19 - ?% of 240 = -2196
What will come in the place of question mark (?) in the given expression?
642 - 362 = ? X √1225
If 1560 ÷ 30 + 2025 ÷ 45 - z + 33 × 7 = 1848 ÷ 24 × 234 ÷ 39, then the value of z is:
If 32x + 1 – 3x = 3x + 3 – 32, then values of x are:
(54/6) × 5 + 12 × (17/2) = ?% of 700
((9.77)0- 〖(0.1)〗(-1))/(〖(6/24 )〗(-1) ×(3/2)3+ 〖((-2)/6)〗(-1) ) = ?
...(160 × 12 - 13 × 20)/(120 × 2 + 2 × 35 + 2 × 11) = ?
