Self Maths Puzzle Category

How can you make a total of 1000 by using sixteen 4's?

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Self Other Question

slove it
intregation of (cos5x+ cos4x )/(1 - 2cos2x)
I can finish a work in 15 days at 8 hr day. you can finish a work in 20/3 days at 9 hr day. Find in how many days we can finish job working 10hrs a day??
option:-
a. 3.5 days b. 4 days c. 4.5 days d. 5
days