Vishwanath
Monday, February 18, 2013
21. | If 3(x-y)= 27 and 3(x+y)=243, then x is equal to |
| A. 0 | B. 2 | |
| C. 4 | D. 6 | |
Answer:option:C
3(x - y) | = 27 |
= 33 |
x - y = 3. ......(1) |
3(x+y) | = 243 |
= 35 |
x + y = 5. .......(2) |
On solving equations 1 and 2, we get | = x=4. |
Title : Surds And Indices Q21
Description : 21. If 3 ( x-y ) = 27 and 3( x+y )=243, then x is equal to A. 0 B. 2 C. 4 D. 6 Answer:option:C 3 ( x - y ) = 27 = 3 3 x - y = 3. ......(...
Rating : 5
