A man can row at 36 km/hr in still water. In a stream which is flowing at 12 km/hr, it takes him 3 hrs to a place and back. How far is the place?
Let distance= x km, Rate upstream = 36 - 12 = 24 km/hr Rate downstream = 36 + 12 = 48 km/hr. ∴ Time taken upstream= x/24 and Time taken downstream= x/48 ∴ x/24 + x/48 = 3 ⇒ 3x/( 48) = 3 ⇒ x = 48 km.
If in a certain code language ‘+’ represents ‘×’, ‘–’ represents ‘+’, ‘×’ represents ‘÷’ and ‘÷’ represents ‘–’...
If '$ means +', '# means –, '@ means ×' and '* means ÷', then what is the value of '16 $ 4 @ 5 # 72 * 8' ?
Which two signs should be interchanged to make the following equation correct?
7 × 6 ÷ 3 – 6 = 40 + 20
Select the correct combination of mathematical signs to sequentially replace the * signs and to balance the given equation.
23 * 2 * 2 * 5 * 18
If 6$144 = 24, 8$232 = 29 then what is the value of 5$110 = ?
A $ B means A X B, A & B means A - B, A % B means A ÷ B and A # B means A + B, then what is the value of 320 & 80 # 120 % 24 $ 50?
If ‘%’ means (÷), ‘&’ means (+), ‘$’ means (×), and ‘@’ means (-), then what is the value of the expression:
25 & 35 % 7 @ 14 $...
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54 D...
If ‘@’ means (×), ‘$’ means (-), ‘#’ means (÷), and ‘%’ means (+), then what is the value of the expression:
[32 % {(49 # 7) $ ...
If + means ÷, × means –, – means × & ÷ means +, then 32 + 16 – 13 x 18 ÷ 2 = ?