Physical and chemical change

 Physical change

The change in which  no new Substance form is called physical change

Chemical change

 The change in which two subtitle react chemically form a new chemical change

What is reactant

Ex_9A

 Solution 1:

Cost of 15 oranges = 110

Cost of 1 orange = 110 1.5

110 * cost of 39 oranges = 15 x 39 = 22 x 13 = 286

Solution 2:

Amount of sugar bought for 260 = 8 kg

8 Amount of sugar bought for 1 = 260 kg

8 Amount of sugar bought for 877.50

260 × 877.50 kg 8 87750 260 X 100 -27 kg

Solution 3:

Length of the silk purchased for 6290 = 37 m

37 Length of the silk purchased for 1 m 6290

37 Length of the silk purchased for₹4420 x 44-20 m 6290 = 26 m

Anant math class 7th

          

      Exercise 1C

Question 1

1 answer =(5)

2 answer=(-7)

3 answer=(-4)

4answer=(-11)

5 answer=(-6)