Afla un numar, stiind ca: a)jumatatea treimii lui este 25; b)sfertul jumatatii lui este 48; c)treimea sfertului sau, marita cu 17 este 80; d)triplul jumatatii lui, micsorat cu 28 este 755; e)dublul treimii lui, marit cu 80 este 400.

(a) 150

(b) 384

(c)  84

(d) 261

(e ) 480

Step-by-step explanation:

(a)

Let 'a' be a number such that  the half of his third is 25; i.e.

Hence, the number is 150.

(b)

Let 'b' be  the number such that the quarter of his half is 48 i.e.

Hence the number is 384.

(c)

Let 'c' be the number such that the third quarter or, increased by 17 is 80.

Hence, the number is 84.

(d)

Let 'd'  be the number such that its triplet, reduced by 28 is 755

Hence the number is 261.

(e  

Let 'e' be the number such that double his third, increased by 80 is 400.

Hence, the value of the number is 480.