What mass of lead will weigh as much as 8 gm of iron, when both are immersed in water? (Given specific gravities of iron and lead are 8 and 11 respectively).

Apparent wt= Real wt- upthrustApparent weight of =(8−88)g  first body (iron)Apparent weight of =(m−m11)g  lead under equilibrium(8−1)g=m(1011)g      7=10m11⇒m=7.7gm