Question
If ‘A’ stands for ‘−’, ‘B’ stands for ‘×’, ‘C’ stands for ‘+’ and ‘D’ stands for ‘+’, what will come in place of the question mark ‘?’ in the following equation? 23 D 18 C 3 B 5 A 17 = ?
The correct answer is
39
Let’s decode the symbols:
A = −
B = ×
C = +
D = +
So the expression becomes:
23 + 18 + 3 × 5 − 17
Apply BODMAS/PEMDAS:
Multiplication first:
(3 × 5 = 15)
Now compute the rest:
(23 + 18 + 15 − 17)
Step-by-step:
(23 + 18 = 41)
(41 + 15 = 56)
(56 − 17 = 39)
Final Answer: 39
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Important Questions from Work and Kinetic Energy
A car of mass m accelerates uniformly from rest under a constant force F. After traveling a distance d, what is the kinetic energy of the car?
To move an object on a horizontal table, one needs to apply:
- Two objects A and B of different masses have same momentum, which one will have more kinetic energy, if mass of A is more than the mass of B?
- A body of mass 10 kg is thrown vertically upwards with a velocity of 10 m/s. How much potential energy will be possessed by the body when it reaches the maximum height? (Take $g = 10 \text{ m/s}^2$)
- A car has a mass of 120 kg. How much work must be done to raise its speed from 72 km/h to 108 km/h?
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