51.

If 7 spiders make 7 webs in 7 days, then 1 spider will make 1 web in how many days?

• 1
• 

• 7

• 7

A fan is listed at ₹ 150/- with a discount of 20%. What additional discount must be offered to the customer to bring the net price to ₹ 108/-?

• 

• 15%

• 8%

• 8%

Three numbers are in the ratio 1 : 2 : 3 and the sum of their cubes is 4500. The smallest number is

• 4

• 5

• 6

• 6

If by selling an article for ₹ 390/- a shopkeeper gains 20%, then the cost is

• ₹ 370/-

• ₹ 325/-

• ₹ 350/-

• ₹ 350/-

There is a 4% increase in volume when a liquid freezes to its solid state. The percentage decrease when solid melts to liquid again, is

• 

• 4%

• 
• 

A man travelled a distance of 61 km in 9 hours, partly by walking at a speed of 4 km/hr and partly on bicycle at speed of 9 km/hr. The distance covered by walking is

• 16 km

• 12 km

• 15 km

• 15 km

The rate of simple interest per annum at which a sum of money double itself in , is:

• 4%

• 5%

• 6%

• 6%

If a + b + c = 0, then the value of a³ + b³ + c³ is

• abc

• 2abc

• 3abc

• 3abc

The value of  is

In  Δ ABC,  DE || AC, where D and E are two points lying on AB and BC respectively. If AB = 5 cm and AD = 3 cm, then BE : EC is

• 2 : 3

• 3 : 2

• 5 : 3

• 3 : 5