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2) If it has rained 276 mm 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.

(NCERT, EX -12.3)

Solution:

Amount of rain in the last 3 days = 276mm

Amount of rain in 1 day = 276/3

Amount of rain in 1 day = 92 mm

Amount of rain in a week = Amount of rain in 7 days

Amount of rain in 7 days = 7 x (Amount of rain in 1 day)

= 7x 92 = 644 mm

1 mm = cm

So, 644 mm = cm = 64.4 cm

Therefore, 64.4 cm amount of rain will fall in 7 days.

Video Link: https://www.khanacademy.org/math/pre-algebra/pre-algebra-ratios-rates/pre-algebra-
rates/v/finding-unit-prices