The height of Mount Everest is 20 times the height of Empire State building.
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20y, where y is height of Empire State Building.67. 2p + 3 68. 13 – (–3) z (=13+3z) 69. 10 + 70. 3x + 1 71. 10 – 6 q 72. 3y + 4 = 10, 2x – 3 = 1 73. 2t + 3 = 3 74. x + 1 = 0 OOLRLPNOV k_rfck_rgaq 75. The cost of pen is 5 times the cost of a pencil. 76. Amount left with Leela is Rs 10,000 more than the amount she contributed towards Prime Minister’s Relief fund. 77. Age of Kartik’s Father is seven times the age of Kartik. 78. The difference between maximum and minimum temperature on a day in Delhi was 10°C. 79. Last year Jay planted 10 more plants than twice the number of plants planted by John. 80. Sharad reduced the consumption of tea per day by 5 cups after having some health problem. 81. The number of students dropping out this year is 30 less than the number of students dropped last year. 82. The price of petrol per liter decreased this month by Rs 5 than its price last month. 83. Khader’s monthly salary increased by Rs 1000 in the year 2006 than in 2005. 84. The number of girls enrolled this year was 10 less than 3 times the girls enrolled last year. x 2x x 85. (a) 2x – 13 = 3 (b) = x – 5 (c) = 12 (d) 2x + 9 = 13 (e) –1=1 5 3 3 86. (a) p = 3a (b) d = 2r (c) s = c + p (d) a = p + i 87. (i) x – 2 (ii) x + 35 (iii) x + 32 (iv) 8 x 88. m 0 1 2 3 4 Solution is m = 2 2m – 5 –5 –3 –1 1 3 89. 50 p – 1800 90. 8 x + 100L 91. m × m sq cm. 92. The perimeter of a triangle is the sum of all its sides. 93. The perimeter of a rectangle is twice the sum of its length and breadth. 94. (m + 40)kg 95. (i) 2 (r + t) + 10 (ii)15x (iii) (8rt + 4000)sq cm (iv) Rs 23x ANSWERS 161 OOLRLPNOV _lqucpq 96. (i) Sunita : x + 4, Geeta : 2 x + 4, where x is the present age (in years) of Sunita. (ii) Sunita : x – 3, Geeta : 2x – 3 97. (i) – (B), (ii) – (E), (iii) – (C), (iv) – (C), (v) – (A)