3. In a bag there are 5 and 2 rupee coins. If they are equal in number and their
worth is Rs.70, then
(a) The worth of x coins of Rs.5 each.
(b) The worth of x coins of Rs.2 each
(c) The equation formed is
(d) There are —
5 rupee coins and —
2 rupee coins.
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Answer:
(a) The worth of x coins of Rs. 5 each : ₹ 50 or 5 x
Total worth of coins = ₹ 70
2 x + 5 x = ₹ 70
7 x = ₹ 70
x = 70 / 7 = ₹ 10 5 x = 5 × 10 = ₹ 50
(b) The worth of x coins of Rs. 2 each : ₹ 20 or 2 x
Total worth of coins = ₹ 70
2 x + 5 x = ₹ 70
7 x = ₹ 70
x = 70 / 7 = ₹ 10 2 x = 2 × 10 = ₹ 20
(c) The equation formed is : 2 x + 5 x = ₹ 70
7 x = ₹ 70
(d) There are :-
5 rupee coins - x which can be determined only when total no. of coins is given
&
2 rupee coins - x which can be determined only when total no. of coins is given
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