(1) 0.27
The depths, of the two liquids, are in the ratio 4/3 : 7/5 ; ie, 20:21. We can therefore, take the total depth, of the two liquids, as [(20+21)x] units, i.e.; (41x) units.
Apparent depth of the top layer = (20x ÷ 7/5) = 100x/7 units
Apparent depth of the bottom layer = (21x ÷ 4/3) = 63x/4 units
∴ Total apparent depth = (841/28 x)units
∴ Apparent height of the ball = (41x - 841/28 x)units
= 307/28 x units