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"Hatti poured 1/4 of the water from Tank P into Tank Q to fill it to the brim, "
that means the empty space in tank Q is equal to 1/4 of tank P
1/4 of tank P → length x breadth x height (8cm) = 25 x 9 x 8 = 1800 cm³
water left in tank P (fraction) → 1 - 1/4 = 3/4
1/4 of water tank P → 1800 3/4 of water tank P → 1800 x 3 = 5400 cm³
water pour to tank P → full tank Q - water left
full tank Q → 25 x 9 x (15 + 8) = 5,175
water pour to tank P → full tank Q - water left = 5175 - 2775 = 2,400
total capacity of tank P → 5400 + 2400 = 7800 cm³ = 7.8 litres