Question
CSATHardPrelims 2016Maths

A cylindrical overhead tank of radius 2 m and height 7 m is to be filled from an underground tank of size 5.5 m × 6 m. How much portion of the underground tank is still filled with water after filling the overhead tank completely?

Explanation

Step 1: Find the Volume of the Overhead Tank Formula: V=πr2hV = \pi r^2 h Radius (r) = 2, Height (h) = 7 V=π(2)27=28π87.92V = \pi \cdot (2)^2 \cdot 7 = 28\pi \approx 87.92

Step 2: Find the Volume of the Underground Tank Formula: V=LBHV = L \cdot B \cdot H Length (L) = 5.5, Breadth (B) = 6, Height (H) = 4 (assuming full initially) V=5.564=132V = 5.5 \cdot 6 \cdot 4 = 132

Step 3: Find the Remaining Portion of Water in the Underground Tank Volume of water used = Volume of overhead tank = 87.92 m³ Remaining Volume = 13287.92=44.08132 - 87.92 = 44.08

Fraction remaining = Remaining Volume / Initial Volume Fraction remaining = 44.08/132=1/344.08 / 132 = 1/3

Answer: 1/3

Maths PYQs from 2016

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