INCREASE AND DECREASE IN A GIVEN RATIO. If you want to increase $85 in the ratio 7 : 5 there are two possible methods. Method 1 5 parts = $85 1 part =

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Presentation transcript:

INCREASE AND DECREASE IN A GIVEN RATIO

If you want to increase $85 in the ratio 7 : 5 there are two possible methods. Method 1 5 parts = $85 1 part = $85 ÷ 5 = $17 7 parts = 7 × $17 = $119 So answer is $119 Method 2

Example 1Decrease 120 kg in the ratio 19 : 20. Method 1 20 parts = 120 kg 1 part = 120 kg ÷ 20 = 6 kg 19 parts = 19 × 6 kg = 114 kg So answer is 114 kg Method 2

Example A photo measures 20 cm by 15 cm. The photo is enlarged in the ratio 8 : 5. a Calculate the measurements of the enlarged photo. b Write down and simplify the ratio area of enlarged photo : area of original photo 20 cm 15 cm a b area of original photo = area of enlarged photo = area of enlarged photo : area of original photo =768 : 300 =64 : x 20 =300 cm 2 32 x 24 =768 cm 2 2 note: 8 2 : 5 2 = 64 : 25

a Calculate the measurements of the large box. b Write down and simplify the ratio volume of large box : volume of regular box washing powder LARGE Example 3 washing powder REGULAR 20 cm 8 cm 24 cm a b volume of regular box = volume of large box = volume of large box : volume of regular box =7500 : 3840 =125 : x 8 x 24 =3840 cm 3 25 x 10 x 30 =7500 cm 3 A company sells regular size boxes of washing powder. They decide to make a large size box by increasing the dimensions in the ratio 5 : 4. note: 5 3 : 4 3 = 125 : 64

Example 4This tablecloth shrinks when it is washed. The length decreases in the ratio 74 : 75. The width decreases in the ratio 89 : 90. a Calculate the measurements of the tablecloth after it is washed. b Write down and simplify the ratio area of tablecloth before washing : area of tablecloth after washing a b area before washing = area after washing = area before washing : area after washing = : = 3375 : x 225 = cm x 178 = cm 2 length = 225 cm width = 180 cm