Rain in 3 days = 276 mm
∴ Rain in 1 day = \(\frac{276}{3}\)
= 92 mm
∴ Rain in 7 days = 92 x 7 = 644 mm
Thus, the rain in 7 days is 644 mm.
Complete the drawing shown in Fig. 9.14 to indicate where the free ends of the two wires should be joined to make the bulb glow