How much should she pay if she buys 8 coconuts and 9 kg jaggery? Class 7
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How much should she pay if she buys 8 coconuts and 9 kg jaggery? Class 7
Question 1.
How much should she pay if she buys 8 coconuts and 9 kg jaggery? Class 7
Solution:
Amount to be paid
= ₹ 8 × 35 + ₹ 9 × 60 = ₹ (8 × 35 + 9 × 60)
= ₹ (280 + 540)
= ₹ 820.
Question 2.
What is the perimeter of a square with sidelength 7 cm? Use the expression to find out. Class 7
Solution:
Perimeter = 7 + 7 + 7 + 7
= 4 × 7 = 28 cm.
Question 3.
Write formulas for the perimeters of: Class 7
(a) triangle with all sides equal.
(b) a regular pentagon (as we have learnt last year, we use the word ‘regular’ to say that all side lengths and angle measures are equal)
(c) a regular hexagon
Solution:
(a) s + s + s = 3s i.e., p = 3 s
(b) s + s + s + s + s = 5s i.e., p = 5 s
(c) s + s + s + s + s + s = 6s i.e.,p - 6 s