
Doug C. answered 07/06/22
Math Tutor with Reputation to make difficult concepts understandable
Let x = the number
.7x + x = 187 (70% of x = .7x, when added to the original number the result IS 187)
1.7x = 187 (combine like terms)
x = 187/1.7 (division for equality)
x = 1870/17 = 110
Check:
70% of 110 = .7 (110) = 77
77+110 = 187 (checks)