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The sum of 8 times of a number and 2 times of this number is 12.5
Let this number be X
8x+2x=12.5
10x=12.5
x=1.25
Solution equation: 7x + 20% x = 36
7x+20%x=36
7x+0.2x=36
7.2x=36
x=5
(36.5 plus x) multiplied by 20 equals 1500
（36.5＋X）×20＝1500
36.5＋X＝75
X＝75－36.5
X＝38.5
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