Quantitative Aptitude - Arithmetic Ability Questions

The mean of 14 observations is 11. One more observation is included and the new mean becomes 12. The 15th observation is

The value of cos (1110°) is

Points P and Q lie on side AB and AC of triangle ABC respectively such that segment PQ is parallel to side BC. If the ratio of AP:PB is 2:5, and area of Δ APQ is 4 sq cm, what is the area of trapezium PQCB?

√[(1 ­ sinA)/(1 + sinA)] is equal to?

What is the value of cos (90 – B) sin (C – A) + sin (90 + A) cos (B + C) – sin (90 – C) cos (A + B)?

What is the simplified value of 18 - 12 ?

In ΔPQR, S and T are points on side PQ and PR respectively. ST is parallel to QR. If S divides PQ in the ratio 4:1 and length of QR is 15 cm,what is the length of ST?

Determine the value of y-1y2 when y4+1y4=34