Munirathna has a 20 m long pipe. However, he wants a longer watering pipe for his garden. Class 7

Munirathna has a 20 m long pipe. However, he wants a longer watering pipe for his garden. Class 7

Question 1.

Munirathna has a 20 m long pipe. However, he wants a longer watering pipe for his garden. He joins another pipe of some length to this one. Give the expression for the combined length of the pipe. Use the letter-number ‘fe’ to denote the length in meters of the other pipe.

Solution:

Combined length = (20 + k) m.

Question 2.

What is the total amount Krithika has, if she has the following numbers of notes of ₹ 100, ₹ 20 and ₹ 5? Complete the following table: Class 7

Solution:

Question 3.

Venkatalakshmi owns a flour mill. It takes 10 seconds for the roller mill to start running. Once it is running, each kg of grain takes 8 seconds to grind into powder. Which of the expressions below describes the time taken to complete grind y kg of grain, assuming the machine is off initially? Class 7

(a) 10 + 8 + y

(b) (10 + 8) × y

(c) 10 × 8 × y

(d) 10 + 8 × y

(e) 10 × y + 8

Solution:

(d) 10 + 8 × y