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Start learning 50% faster. Sign in nowLet the cost price of each pen be Rs.x So, cost price of 15 pens = Rs.15x According to the question, => (15x – x + 70)/15 = x – 2 => 14x + 70 = 15x – 30 => x = 100 Therefore, the cost price of the pen that was replaced is = Rs.100
Which among the following nuclei is more stable based on neutron-to-proton ratio?
What type of lens is used to correct myopia (nearsightedness)?
Planck’s constant has dimensions equivalent to which of the following?
What is the work done when a force of 10 N moves an object by 5 m in the direction of the force?
A Zener diode differs from a regular diode in that:
A stream of water flowing horizontally with a speed of 20 m/s pushes out of a tube of cross-sectional area 10-1m2 and hits at a v...
Half-life of a radioactive substance is 10 days. The time after which only 1/16th of it remains is:
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A transformer works on which principle?
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