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Let the speed of the boat in upstream be ‘2x’ km/h and in downstream be ‘3x’ km/h, respectively. According to the question: 
Speed of the boat in still water = (2x+3x)/2 = (5×14.4)/2 = 36 km/h.
√256 * 4 – 30% of 190 + ? = 110% of 220
(744 ÷ 6) - (120/5) + 5.5% of 800 = ?2
What will come in the place of question mark (?) in the given expression?
(50 × 6 ÷ 12) × 9 = ?
120 × 195 ÷ 13 - ? = 162
√4761 ÷ 23 + √12769 = ? × 58
Simplify-
x + 3(y + x – 2) – (x + y).
20% of 550 × 25% of 80 = ?2 × 22
(15 × 16) + 242= ? × 16
525 ÷ 21 x 28 – 853 + 264 = ?
