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Q.

A sports teacher has to spend Rs. 1300 when he purchases 10 footballs and 20 Hockey sticks from a shop. However, if he purchases 15 footballs and 15 hockey sticks, the amount spent is Rs. 1350. The cost of one football is

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a

Rs. 50

b

Rs. 40

c

Rs. 45

d

Rs. 55

answer is A.

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Detailed Solution

Cost of football =x

Cost of hockey stick =y

10x+20y=1300⇒x+2y=130→(1)

15x+15y=1350⇒x+y=90→(2)

Solve (1) and (2), y=40

x=50 .

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