You can find n algebraically.
Remember 80% is 0.8.
0.8n=8
n=8/0.8
n=10
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100% is equal to 625000. 80% : 500000 = 100% : N 80%N/80%= (500000 * 100%)/80% N= 5000000/8 N= 625000
275000 : 80% = n : 20%80% * n = 275000* 20%0.8 * n = 275000 * 0.20.8 * n = 55000n = 55000/0.8n = 68750
n = 8
23-8 = 15 so 50-N = 15 N = 35
266.67 160 : 60% = n : 100% 60%n/60% = (160 * 100%)/60% n = 1600/6 n = 266.67