Question
The mean of 12 numbers is 15. When two additional
numbers, x and y , are included, the average increases by 1. Given that the difference between x and y is 20, determine the value of y.Solution
Sum of 12 numbers = 12 X 15 = 180 Sum of 14 numbers = 14 X 16 = 224 So, x + y = 224 - 180 = 44 ----------(i) And, x - y = 20 -----------(ii) Solving (i) and (ii) , we get x = 32 and y = 12 Hence, option a.
More No. System Questions
(7/5) × (3/4) × (5/9) × (6/7) × 3112 = ?
(125 × 12 × √8100) ÷ 150 = ?
8 × 9 + ? – 6 × 11 = 12 × 8
(2197)1/3 + (18)2 − 121 = ? − 69 × 5
(11/12) × (18/22) × (4/3) + 3 = ?2
((67)32 × (67)-18 / ? = (67)⁸
192.251 + 326.233 + 125.021 + 19.273 = ?
[(120)2 ÷24 ×25] ÷ 250 =?
- What will come in the place of question mark (?) in the given expression?
121/? = ?/144
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