Chanamae30viz
Answered

peter is twice as old as paul,paul is  5 years older tha mary.if the sum of theirvages is 31,how old is mary?

Sagot :

Let x be paul, 2x be peter, x-5 be mary.. X+2x+x-5=31 paul is 9 (x) 4x-5=31 peter is 18 (2*9) 4x=36 mary is 4 (9-5) X=9