Question

13. The average attendance of a school for the first
three days of a week 325 and for the first four
days is 320. How many were present on the
fourth day?
(A) 300
(B) 316
(C) 325
(D) 3052​

Answer 1

6. From the sum of 2ab + bc + 3 ac and -7ab -bc + 6ac subtract 12 ab + ac + 8bc.

7. If A = 3xy + 7xz; B = -4xy + 2xz and C = -10 xz + -2xy + yz, then find 2(A + B) -

C

Answer 2

Answer:

The present on the 4th day = 325.

Step-by-step explanation:

Given, the average attendance of a school for the first three days of a week = 325 and the first four days = 320

To find, the present on the 4th day =

Total attendance of first three days of a week = 3 × 325 = 975

also,

Total attendance of first four days of a week = 4 × 320 = 1280

∴ The present on the 4th day = Total attendance of first four days of a week - Total attendance of first three days of a week

The present on the 4th day = 1280 - 975

= 305

Hence, the present on the 4th day = 325.

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