Question

一条公路,第一天修了全长五分之一少十四米,第二天修全长八分之一多五米,剩六十三米,这条路有多长?

Answer 1

x- (1/5 x -14) -(1/8 x +5)=63

x- 1/5 x +14 - 1/8 x -5 =63

x- 1/5 x - 1/8 x =63-14+5

27/40 x =54

x = 54 × 40/27

x=80