Q6. The dimensions of a cuboid are a, b, c units its volume is V cubic units and its whole surface area is S sq. units. Then 1/V = ?
(a) S/2 (a + b + c)
(b) 2/S (1/a+1/b+1/c)
(c) 2S (a + b + c)
(d) 2S/((a + b + c) )
Q7. A, B, C are partners. A receives 2/7 of the profit and B & C share the remaining profit equally. A’s income is increased by Rs. 240 when the profit rises from 10% to 15%. Find the capital invested by A, B and C respectively?
(a) Rs. 4200, Rs. 6000, Rs. 6000
(b) Rs. 4800, Rs. 6000, Rs. 6000
(c) Rs. 4500, Rs. 5625, Rs. 5625
(d) Rs. 4000, Rs. 5000, Rs. 5000
Q8. A and B invested in the ratio 3 : 2 in a business. If 5% of the total profit goes to charity and A’s share is Rs. 855, find the total profit?
(a) Rs. 1200
(b) Rs. 1800
(c) Rs. 1500
(d) Rs. 1600
Q9. Charging 30% above its production cost a radio maker puts a lebel of Rs. 286 on a radio as its price. But at the time of selling it, he allows 10% discount on the labelled price. What will his gain be?
(a) Rs. 198
(b) Rs. 245.40
(c) Rs. 37.40
(d) Rs. 54.40
Q10. A fruit-seller buys some oranges and by selling 40% of them he realises the cost price of all the oranges. As the oranges being to grow over-ripe, he reduces the price and sells 80% of the remaining oranges at half the previous rate of profit. The rest of the oranges being rotten are thrown away. The overall percentage of profit is