Average Practice Test 6

Question : 21 of 40

Marks: +1, -0

The average height of six girls is increased by 14 cm when two of them whose heights 156 and 157 cm are replaced by two new girls. Find the average, of the two new girls.

131 cm
130 cm
128 cm
198.5 cm
155 cm

Validate

Solution:

Total increase in height = (6 × 14) cm = 84 cm
Sum of heights of three new girls = (156 + 157 + 84) cm = 397 cm
∴ Average height of new girls

= 397/2

cm = 198.5 cm

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