Gọi số `N` là `x`
Theo bài ra ta có :
`x × 1/3 : 1/2 - 342 × 50% = 50`
`x × 1/3 : 1/2 - 342 × 1/2 = 50`
`x × 1/3 : 1/2 - 342 = 50 : 1/2`
`x × 1/3 : 1/2 - 342 = 100`
`x × 1/3 : 1/2 = 100 + 342`
`x × 1/3 : 1/2 = 442`
`x × 1/3 = 442 × 1/2`
`x × 1/3 = 221`
`x = 221 : 1/3`
`x = 663`
Vậy số `N = 663`
`#dtkc`