RRB Group-D Model Paper 19 with answers for online practice

Given:
Radius of sphere = 7 cm
Formula:
Number of spheres = (Volume of cuboid) / (Volume of sphere)
Volume of sphere = $\left(\frac{4}{3}\right)\mathit{\pi }{\mathit{r}}^3$
Volume of cuboid = length × breadth × height
Calculation:
Let the number of spheres that can be put be N
N × (volume of sphere) = volume of cuboid
Volume of cuboid = 35 × 56 × 66
Volume of sphere = (4/3)π × 7 × 7 × 7 = (4/3) × (22/7) × $7^3$
⇒ N = (35 × 56 × 66)/(4 × 22 × $\frac{7^2}{3}$ )
⇒ N = (5 × 8 × 3 × 3)/4
⇒ N = 90