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Let the unknown number be n.Then 20 x n = 177 : so n = 177 ÷ 20 = 8.85 or 817/20.
144 + 13 + 20 = 177
Sorry, my previous answer had an error towards the end. 15% off is 100% - 15% or 85% 177 * (100 - 15) / 100 = 177 * 85 / 100 = 177 * 17 / 20 = 150.45
23/20 = 13/20
It is 20/23.