Question 3
If it has rained 276mm in the last 3 days, how many cm of rain will fall in one full week (7 days)? Assume that the rain continues to fall at the same rate.
Rain in 3 days = 276mm
Applying unitary method, where firstly we find the value of one unit and then the value of required number of units.
∴ Rain in 1 day = 2763 = 92mm
∴ Rain in 7 days = 92 × 7 = 644 mm = 64.4cm [∵ 10mm = 1cm]
Thus, total rain in 7 days is 64.4cm.