Shyamala bought 3 kg bananas at ₹ 30/- per kg. She counted 35 bananas in all. Class 7

Shyamala bought 3 kg bananas at ₹ 30/- per kg. She counted 35 bananas in all. Class 7

Question 1.

Shyamala bought 3 kg bananas at ₹ 30/- per kg. She counted 35 bananas in all. She sells each banana for ₹ 5/-. How much profit does she make selling all the bananas? Class 7

Solution:

Cost of 3 kg bananas = 3 × ₹ 30 = ₹ 90

S.P. of 35 (or 3 kg bananas) = 35 × ₹ 5 = ₹ 175

So, her profit = ₹ 175 - ₹ 90 = ₹ 85.

Question 2.

A teacher placed textbooks that are 2.5 cm thick on a bookshelf. The teacher wanted to place 80 textbooks on the shelf. The bookshelf is 160 cm long. How many books could be placed on the shelf? Was there any space left? If yes, how much? Class 7

Solution:

Thickness of 80 textbooks

= 80 × 2.5 cm = 200 cm.

Length of bookshelf = 160 cm.

So, bookshelf is not sufficient.

Books kept can be = 160 ÷ 2.5

= [latex]\frac {160}{2.5}[/latex] = [latex]\frac {1600}{25}[/latex] = 64

Books left = 80 - 64 = 16.