IQ of a person is given by the formula

IQ = (MA/CA)*100,

where MA is the mental age & CA is the chronological age. If 80≤IQ≤140 for a group of 12 yr children, find the range of their mental age.

80 smaller than and equal to IQsmaller than and equal to 140

80 smaller than and equal to MA/CA *100 smaller than and equal to 140

80smaller than and equal to MA/12 *100 smaller than and equal to 140

80smaller than and equal to MA/3*25smaller than and equal to 140

80*3/25 smaller than and equal to MA smaller than and equal to 140 *3/25

48/5 smaller than and equal to MA smaller than and equal to 84/5

9.6 smaller than and equal to MA smaller than and equal to 16.8