Question
A set contains ten numbers. The average of the first
six numbers is (x − 5), and the average of the last three numbers is (x + 1). The average of the entire set is 'x'. If the 7th number of the set is 48, then find the value of 'x'.Solution
Sum of the numbers of set = 10x Sum of first 6 numbers = 6(x − 5) = 6x − 30 Sum of last 3 numbers = 3(x + 1) = 3x + 3 ATP, 6x − 30 + 48 + 3x + 3 = 10x 9x + 21 = 10x x = 21
More Average Questions
√(82 × 7 × 52 - 175) = ?
What will come in the place of question mark (?) in the given expression?
(24 2 – 16 2 ) + 75% of 40% of 480 = ?
? (1/2) = 236 – 25 × 18/2 + 396 ÷ 22
- What will come in the place of question mark (?) in the given expression?
? = 20% of 25% of 15% of 12000 54 ×70 ×33 ×42 =?
(22.5 × 24) ÷ 40 + 51.50 = ? ÷ 5.25
? = 15% of 2400 + 140% of 4200 – 12 3
30% of 8/5 × 5/7 × 2870 =?
- What will come in place of (?), in the given expression.
(56 × 3) + (480 ÷ 6) = ?
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