Quantitative Aptitude - Arithmetic Ability Questions

In the following question, select the odd word from the given alternatives.

The traffic lights at four different road crossings change after every 15 sec, 18 sec, 27 sec and 30 sec respectively. If they all change simultaneously at 6:10:00 hours, then at what time will they again change simultaneously?

Two numbers are 40% and 50% lesser than a third number. By how much percent is the second number to be enhanced to make it equal to the first number?

The inradius of a equilateral triangle is 10 cm. What is the circum-radius (in cm) of the same triangle?

If aq-r+br-p-cp-q, then find the value of (pa + qp + rc) is

Reflection of the point (-3,6) in the x-axis is

Select the odd word/letters/number/number pair from the given alternatives.

Δ ABC is right angled at B. If m∠A = 60°, then what is the value of sec C.sin A?