The instructions of a program can be categorized into four types, A, B, C, and D. Type A consists of 100 instructions, Type B consists of 150 instructions, Type C consists of 250 instructions, and Type D consists of 500 instructions. In the instruction set, each instruction takes the same amount of time to execute. The entire program takes 1000 seconds to run. What is the improved execution time if the Type D instructions are improved by a factor of 2

there is no universally accepted definition of art. although commonly used to describe something of beauty, or a skill which produces an aesthetic result, there is no clear line in principle between (say) a unique piece of handmade sculpture, and a mass-produced but visually attractive item. we might say that art requires thought - some kind of creative impulse - but this raises more questions: for example, how much thought is required? if someone flings paint at a canvas, hoping by this action to create a work of art, does the result automatically constitute art?