Question
If 4x + 1/5x = 4, then find value of 125x³ +
1/64x³Solution
4x + 1/5x = 4 By multiplying 5/4 , 4x × 5/4 + 1/5x × 5/4 = 4 × 5/4 5x + 1/4x = 5 on cubing both the sides (5x+1/4x)3 = (5)³ 125x³ + 1/64x³ + 3 × 5x × 1/4x (5x+1/4x) = 125 125x³ + 1/64x³ + (3×5)/4 × 5 = 125 125x³ + 1/64x³ + 75/4 = 125 125x³ + 1/64x³ = 125 - 75/4 125x³ + 1/64x³ = (500-75)/4 125x³ + 1/64x³ = 425/4
More General Aptitude Questions
2(3/4) of 2880 + 54% of 7520 - ? = 302
Find the value of the following expression:
372 ÷ 56 × 7 – 5 + 2
- What will come in place of (?), in the given expression.
(5³ + 3²) × 2 = ? (1225/25) - (192/96) + (50/5) = ?
What will come in the place of question mark (?) in the given expression?
(555 + 385 - 535) ÷ 15 X ? = 36 X 30
- What will come in place of (?), in the given expression.
75% of 640 – 20% of 150 = ? `(21 xx 51 + 54)/(9 xx 14 - 30 )` =?
95% of 830 - ? % of 2770 = 650
