Question

10. The total cost of 5 tables and 2 chairs is Rs.990. If a table cost Rs.30 more than a chair, find the price of each.

11. Find mean , median and mode of the following data:
2, 3 , 4, 8 ,10 , 12, 3 , 4 , 4 , 10,12.

Answer 1

5T+2C=990eq(1),

T-C=30,

then

2T-2C=60eq(2),

7T=(990+60),

7T=1050,

T=150,

then

C=150-30=120

explaination:-

Let the cost of 1 table be x

And 1 chair be y

So , according to the question

5x + 2y = 990 (eq.1)

The cost of a table is Rs.30 more than a chair

So, x = y + 30 (eq.2)

Substituting x's value from (eq.2) to (eq.1)

5(y+30) + 2y = 990

5y + 150 + 2y = 990

7y + 150 = 990

7y = 990 - 150

7y = 840

y = 840/7 = Rs.120

We know that x = y +30

So, x = 120 + 30

x = Rs.150

The cost of 1 table is Rs.150 and 1 chair is Rs.120

Answer 2

Step-by-step explanation:

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