a poster of size 20 cm by 16 cm is pasted on the sheet of cardboard such that there is a margin of3.5 cm along each side of poster find : 1. the total area of the margin 2. the cost of cardboard used to rate of ₹1.20 cm ²
Answers
Answer ♡
Given,
• if 40% of a number is equal to
two third of another number.
To find ,
• Ratio of the first number to the
second number .
Solution ,
Let
• A and B be the two number
such that.
According to the question
• 40% of A = 2/3 B
Now ,
• 40 A/100 = 2B/3
• A/B = (2/3 × 5/2)
• A/B = 5/3
• A:B = 5:3
Hence,
• the ratio of the first number to
the second number is 5:3
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Answer:
1)67.75
2)465.3
Step-by-step explanaTION
1) TOTAL AREA OF MARGIN = CARDBOARD AREA-POSTER AREA
AREA OF POSTER =LENGTH×BREADTH
=20×16=320 cm²
LENGTH OF CARDBOARD = 20+MARGIN (3.5)
=23.5
BREADTH OF CARDBOARD=16+3.5
=19.5
AREA OF CARD BOARD=LENGTH×BREADTH
=23.5×16.5
=387.75
AREA OF MARGIN= AREA OF CARDBOARD-AREA OF POSTER
=387.75-320
=67.75CM²
2)COST OF CARDBOARD=AREA OF CARDBOARD×COST
=387.75×1.20
=465.3