Question

Age group (in years)	No. of Persons	Measure of central angle
20 – 25	80	`square/200 xx 360^circ = square`
25 – 30	60	`60/200 xx 360^circ = square`
30 – 35	35	`35/200 xx square = 63^circ`
35 – 40	25	`25/200 xx 360^circ = square`
Total	200	`square`

Answer 1

Age group (in years)	No. of Persons	Measure of central angle
20 – 25	80	`bb80/200 xx 360^circ = bb(144^circ)`
25 – 30	60	`60/200 xx 360^circ = bb(108^circ)`
30 – 35	35	`35/200 xx bb(360^circ) = 63^circ`
35 – 40	25	`25/200 xx 360^circ = bb(45^circ)`
Total	200	`bb(360^circ)`