Question

the average temperature of first three days is 27?c and that of the next three days is 29?c if the average of the whole week is 28.5?c the temperature of the last day of the week is

Answer 1

STEP 1: Find sum of the first 3 days

Average of first 3 days = 27

Sum of first 3 days = 27 x 3 = 81

.........................................................................................................

STEP 2: Find sum of the next 3 days:

Average of next 3 days = 29

Sum of next 3 days = 29 x 3 = 87°

..........................................................................................................

STEP 3: Find sum of the 6 days:

Sum of the 6 days = 81 + 87 = 168°

..........................................................................................................

STEP 4: Find sum of the whole week

Average of the whole week = 28.5

Sum of the whole week = 28.5 x 7 = 199.5°

..........................................................................................................

STEP 5: Find last day:

Last day = 199.5 - 168 = 31.5°

..........................................................................................................

Answer: The temperature on the last day of the week is 31.5°