Percents/Geometry and Measure

and 0 .03 Exercise 6 .3

Q12 . Let the number be x then , 75 of x 150 i .e . 0 .75x 150 therefore , x 150 /0 .75 200

Q18 . Percentage of faulty parts in the 10

Q46 . Let the number be x then

6 .5 of x 325 i .e . 0 .065x 325 therefore , x 325 /0 .065 5000

Q50 . The desired number is 48 .3 of 1500 0 .483 1500 724 .5

Exercise 6 .3

Q12 . The rate of interest is r (275 100 (2500 1 annum 11 per

annum

Q26 . The new enrollment will be 900 7 of 900 900 (1 0 .07 900 1 .07 963

Q42 . Time required for checking all the s 300s /0 .40 750s

Q56 Q68 . New salary of Jerry 18500 (1 0 .105 per annum 20442 .5 per annum

Q70 . Value of investment at the end of the year 6400 (1-0 .082 5875 .2

Section 7 .1

Q54 . 4lb 7oz

Q74 . 1 qt 2 pt 40 fl oz

Therefore , 3 qt 120 fl oz 1 pt 9 fl oz 29 fl oz and 2 pt 10 fl oz 50 fl oz

Therefore , fluid remaining 120 - (29 50 ) fl oz 41 fl 1 qt 1 fl oz

Section 7 .2

Q50 . a ) kilometer b ) centimeter c ) micrometer d ) meter

Section 7 .3

Q70 . NO emission by US in 1987 19 .5 million ton 19 .5x106x103 kg 1 .95x1010 kg

Section 7 .4

Q6 . 72 inch 72 2 .54 cm 182 .88 cm

Q12 . 7 L (7 / 1 .1365225 ) qt 5 .13 qt

Q18 . 55 mi /hr (55 1 .6 ) km /hr 88 km /hr

this is the maximum speed at which Samantha can drive

Section 7 .5

Q6 . line because it has arrows at both of its ends

Q26 . angle zxy an acute angle

Q52 . angle a 56o angle b angle c 124o

Section 7 .6

Q2 . Obtuse

Q10 . scalene

Q24 . Angle D Angle F (180o - 72o /2 108o /2 54o

Q26 . Triangle a and Triangle b are similar as all three angles of theirs are equal

Q44 . Height of the tree will be h 5m /0 .4 12 .5 m

Section 7 .6 Q16 . Using Pythagorean Theorem , length of the unknown side x will be given as...