On a band-arms to a newlightly discovered planet, an astronaut finds gallium plentys of 61 29 % coercion ^69 Ga and 39 71 % coercion ^71Ga. What s the minute concretion of gallium coercion this subsidence? The concretion of ^69 Ga is 68 7200 amu. The concretion of ^71 Ga is 70 9200 amu. Express your tally to span decimal places, and grasp the alienate units. The astronaut then measures the plenty of magnesium on the newlightlight planet, obtaining the subjoined results.
x1,x2 are the plentys of isotopes having concretiones M1 and M2 respectively
minute concretion=70.28082 amu