In parallelogram QRST if m\measuredanglem∡STQ=115^{\circ}
∘
find m\measuredanglem∡QRS.

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

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answer: 8 years

step-by-step explanation:

the explanation is that in 8 years the child will be 20 and in 8 years the father will be 40 and 20 is half of 40.

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6: 4= 3/2

18: 8= 9/4

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