Q130 of 140 Page 196

In a debate competition, the judges decide that 20 per cent of the total marks would be given for accent and presentation. 60 per cent of the rest are reserved for the subject matter and the rest are for rebuttal. If this means 8 marks for rebuttal, then find the total marks.

⇒ Let x be the total marks


⇒ Marks given for accent and presentation = 20% of x = × x =


⇒ Remaining marks = x –


=


⇒ Marks reserved for subject matter = 60% of rest marks = × =


⇒ Now, remaining marks = –


=


∴ = 8


⇒ x = 25


More from this chapter

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128

Harish bought a gas-chullah for Rs 900 and later sold it to Archana at a profit of 5 per cent. Archana used it for a period of two years and later sold it to Babita at a loss of 20 per cent. For how much did Babita get it?

 129

Match each of the entries in Column I with the appropriate entries in Column II:

Column I


i. 3:5


ii. 2.5


iii. 100%


iv.


v.


vi. 12.5%


vii. SP when CP = Rs 50 and loss = 6%


viii. SP when CP = Rs 50 and profit = Rs 4


ix. Profit % when CP = Rs 40 and SP = Rs 50


x. Profit when CP = Rs 50 and SP = Rs 60


xi. Interest when principal = Rs 800,


Rate of interest = 10% per annum and period = 2 years


xii. Amount when principal = Rs 150, Rate of interest = 6% per annum and period = 1 year


Column II


A. Rs 54


B. Rs 47


C. Rs 53


D. Rs 160


E. 60%


F. 25%


G.


H. 250%


I. Rs 159


J.


K. 20%


L. 0.125


M. 3 : 2


N. Rs 164


O. 3 : 3

131

Divide Rs 10000 in two parts so that the simple interest on the first part for 4 years at 12 per cent per annum may be equal to the simple interest on the second part for 4.5 years at 16 per cent per annum.

 132

Rs 9000 becomes Rs 18000 at simple interest in 8 years. Find the rate per cent per annum.