Question
The speed of the stream is 12 km/h. Boat ‘A’ covers
100 km distance against the stream in 5 hours and boat ‘B’ covers 80 km distance against the stream in 2 hours. The speed of boat ‘B’ in still water is how much percent of the speed of boat ‘A’ in still water?Solution
Speed of boat ‘A’ upstream = 100/5 = 20 km/h Speed of boat ‘B’ upstream = 80/2 = 40 km/h Speed of the boat ‘A’ in still water = 20 + 12 = 32 km/h Speed of the boat ‘B’ in still water = 40 + 12 = 52 km/h Required percentage = (52/32) × 100 = 162.5%
If '+' means '–', '–' means '×', '÷' means '+' and '×' means '÷', then ' 30 – 12 + 20 × 10 ÷ 10 ' = (?)
...Which of the following “signs” are placed in place of “symbols” given in equation to make the equation true?
8 @ 24 # 12 + 51 × 3 ÷ ...
If “+” means “minus”, “×” means “divided by”, “÷” means “plus”, and “-“ means then “multiplied by”
180 × 9 –...
If 22 – 16 means 352, 450 + 50 means 9, 9 ÷ 3 means 12, 11 x 8 means 3, then ' 280 – 5 x 240 ÷ 450 + 9 x 26' = ?
Which two signs should be interchanged to make the following equation correct?
52 – 27 ÷ 9 + 7 × 5 = 20
Select the correct combination of mathematical signs that can sequentially replace '*' sign and balance the equation given below.
90 * 5 * 15 * 2...
Select the correct combination of mathematical signs to sequentially replace the * signs and balance the given equation.
24 * 2 * 16 * 2 * 13 = 53
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation:
76 *(5*8*4)*9*75
Which two signs should be interchanged to make the following equation correct?
38 ÷ 26 – 2 + 5 × 4 = 45
If “+” means “minus”, “×” means “divided by”, “÷” means “plus”, and “-“ means then “multiplied by”
210 × 7 –...
