Question
A motor-cycle covers 160 km with a speed of 70 km/hr.
find the speed of the motor-cycle for the next 170 km journey so that the average speed of the whole journey will be 90 km/hr.Solution
Average speed of whole journey = 90 km/hr Using the formula, average speed = 2xy/(x + y)  x = speed of first 160 km = 70 km/hr 90 = 2 x (70 x y)/(70 + y) = 126 km/hr
If ‘*’ represents 12, '@' represents 48, '$' represents 24, and ‘!’ represents 6, then what mathematical equation below will be ...
Select the correct combination of mathematical signs that can sequentially replace the '$' signs and balance the given equation.
6 $ 42 $ 14 $ 6 $ 40 = -16
Which two digits and signs can be interchanged so as to balance the given equation?
30 + 10 X 5 - 12 ÷ 3 = 33
In the following question, which mathematical operators can be used so that the expression will become correct?
9 * 6 * 28 * 4 * 30
If '+' means 'subtraction', ' X ' means 'addition', '-' means 'division' and '÷' means 'multiplication', then what is the value of the following expres...
If + denotes ÷, × denotes -, - denotes ×, and ÷ denotes +, what is the value of the following expression:
124 + 4 × 5 – 6 ÷ 6 + 3 = ?
...If A # B means A + B, A $ B means A - B, A % B means A X B and A & B means A ÷ B, then what is the value of '154 & 22 % 5 $ 68 # 84'?
After interchanging the given two signs, what will be the value of the given equation? + and ÷
144 ÷ 12 + 36 × 3 - 18
What is the code for ‘it’?
Select the correct combination of mathematical signs that can sequentially replace the * signs and balance the given equation.
48 * 495 * 5 * 2 * 120 = 126
