Let the distance be ‘D’ km According to the question, Downstream speed x + y = d/20 or d = 20 (x+y) .......... (i) Upstream speed x-y = d/30 or d = 30(x-y) ........... (ii) Comparing (i) & (ii) 20(x+y) = 30(x-y) 2(x+y) = 3(x-y) 2x + 2y = 3x - 3y x = 5y Hence, y = Speed of the current = 12 km/hour. Speed of boat, x = 5 × 12 = 60 km/hr
26 2 – 13% of 400 + (529 ÷ 23 2 ) = ? 2
4.7 × 3.5 + 4.2 × 4.5 = 22.5 × 3.5 - ?
72 x 60 x 22 x 32 =?
5 + 2 × 3 ÷ (3 × 2) ÷ 4
168 163 153 138 118 ?
...What will come in the place of question mark in the given expression?
√(16 2 + 3 of 11) + 21% of 300 = ? 2 of 5
(25.111 % of 200) × 26 ÷ 12.99 – 18.88 × 15.82 + 150.33% of 3√ 4917 = ? – 200
...125% of 80 – 6 × 4 = ? × 13 – 54
If x²- 5x + 1 = 0, what is the value of x² + 1/x2?
√4096 + 4/5 of 780 − ? = 296
