Removed 17713

The miner removed 135 carts of coal in 5 days so that the next day he removed three carts of coal more. How many carts did he drive on the first day?

Correct answer:

a =  21

Step-by-step explanation:

d=3 n=5 s5=135  s = n (a+b)/2 b = a + (n1)d  s5 = n (a+a+(n1) d)/2  2 s5/n = 2a + (n1) d  a=s5/n(n1) d/2=135/5(51) 3/2=21



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