Question
If x + y = 2 and 1/x + 1/y = 18/15, then find the value
of (x3 + y3)?Solution
Given that, x + y = 2 and 1/x + 1/y = 18/15 Using, 1/x + 1/y = 18/15 (x + y)/xy = 18/15 2/xy = 18/15 Therefore, xy = 15/9 Now, by using formula x3 + y3 = (x + y) [(x + y)2 – 3xy] = 2 (4 – 3 × 15/9) = 2 (4 – 5) = -2
What value should come in place of the question mark (?) in the following question?
2048 ÷ 16 + 256 × 2 − 180
...What will come in the place of question mark (?) in the given expression?
55% of 1600 – (18 × 50) = ? ÷ 16
Evaluate: 18 ÷ 3 × 4 + 6 − 5
18, 25, 33, 42, 52, 63, ?
√(24 × 5 ÷ ?) × 4 = 56 + 34 – 10
25% of 1600 – 152 = ? × 5
89 ÷ 512 × (1/64) = (23)?
What will come in the place of question mark (?) in the given expression?
? = {1026 ÷ 54 + 17 × 13 – (384 ÷ 24)}
?% of 320 - 69 = 123
520% of 360 – 12% of 400 = ? x 4
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