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Which of the following ratios is greater?(iii) $5:8$ and $7:10$(iv) $\left( 5/2 \right):\left( 15/4 \right)$and $\left( 5/3 \right):\left( 11/6 \right)$

The ratio is used for comparing two quantities of the sane kind.

The ratio formula for two numbers says a and b is given by a:b or a/b. When two or more such ratios are equal, they are said to be in proportion.

The concept of ratio and proportion is majorly based on ratios and fractions.  

Solution:

Given ratio can be written as, $5/8$ and $7/10$

Then,

$5\times 10<8\times 7$

$50<56$

Therefore,

So, $7:10$ is greater.

Solution:

Given ratio, $\left( 5,2 \right):\left( 15/4 \right)$and$\left( {5}/{3}\; \right):\left( {11}/{6}\; \right)$

$\left( 5/2 \right):\left( 15/4 \right)=\left( 5/3 \right)\times \left( 4/15 \right)=2/3$

$\left( 5/3 \right):\left( 11:6 \right)=\left( 5/3 \right)\times \left( 6/11 \right)=10/11$

Consider, $2/3:10/11$

$2\times 11<3\times 10$

$22<30$

$2:3<10:11$

$5/2:15/4<5/3:11/6$

Therefore, $5/3:11/6$is greater.