A boatman rows 7 km in 10 minutes, along the stream and 42 km in 2 hours against the stream. The speed of the stream is:
Rate downstream = 7/10 x 60 = 42 km/hr Rate upstream = 42/2 = 21 km/hr Speed of current = 1/2 (Rate downstream – Rate upstream) ⇒ 1/2 (42 – 21) km/hr = 10.5 km/hr
35% of 840 + 162 = ? – 25% × 300
525 ÷ 21 x 28 – 853 + 264 = ?
√38809 × √3249 – (91)2 = (?)2 + (50)2 – 36
Simplify the following expression:
(164-1)/17×15× (28+1)
2048 × 1824 ÷ 76 = (? - 212) × 64
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64% of 500 + (420/?) = 182
(3/7) of 700 + 33(1/3)% of 339 - 69 =?
1549.8 ÷ 8.2 + 65.6 × 55 = (? × 4) + (42 × 30.5)
