Splification - Quantitative Aptitude
Q51. Rahim had 70 currency notes in all, some of which were of Rs. 100 denomination and the remaining of Rs. 50 denomination. The total amount of all these currency notes was Rs. 4000. What is the value of 100 rupee notes ?
(a) Rs. 800
(b) Rs. 950
(c) Rs. 1000
(d) Rs. 1100
Answer: (c) Rs. 1000
Let, the no. of 100 rupee notes be x
∴ No of 50 rupee notes be 70 - x
A/Q 100 X x + 50 (70 - x) = 4000
⇒ 2x + 70 - x = 4000/50 = 80
⇒ x = 80 - 70 = 10
∴ Value of 100 rupee notes be Rs. 10 X 100 = Rs. 1000
Q52.
| If 3x - 5y = 5 and | x | = | 5 | then (x+y) = ? |
| x + y | 7 |
(a) 7
(b) 9
(c) 11
(d) 12
Answer: (a) 7
| x | = | 5 |
| x + y | 7 |
⇒ 7x = 5x + 5y
⇒ 2x - 5y = 0 ------- (1)
And 3x - 5y = 5 ------ (2)
(2) - (1) ⇒ x = 5
(1) ⇒ 2 X 5 - 5y = 0
⇒ -5y = -10
⇒ y = 2
Now x + y = 5 + 2 = 7
Practice Test Exam